To cater the funeral myself? WWYD

As others have suggested, use the 'food to order' option at the supermarket and order the type of buffet food required (sandwiches etc)
I have in fact done this myself, though not for a funeral, although a funeral I went to a few months ago had also done this.
A lot depends on where you plan to hold your wake/reception and how many are coming.
A funeral I went to some years ago ran out of food. (A private hall, with caterer suggested by the hall). More people came than expected.
So if you are in a hotel (or possibly a pub) it might be easy to make up some extra food.
If in your own house, I'd still order in the food, tho.

I catered for my mums funeral but it was at my home and only for about 25 people. I wouldn’t want to do it for larger numbers or at a pub. It went well but we had an afternoon funeral because my mum was never a morning person 😊The attendees were very complimentary and it felt like the right thing to do. It was the way we had handled my dads a few years earlier. My cousins got M&S platters for my aunties and they were lovely.

I'd buy M & S - I've done this for a buffet.
I'm not buying anything from Morrisons as American owned company.

Order from M and S. They do various platters and the food is lovely.

What time is it? If it's in the afternoon and people have had lunch, you can get away with a hot drink and a piece of cake.

I work in a events venue and that is not uncommon in the afternoon; some people have just booked us for a couple of hours, bar open, plenty of tea/coffee and a piece of cake. Close the bar when the family would like guests to start heading off.

If anyone in the family has access to Costco, you can order platters of their wraps and sandwiches ready made for the day. Much cheaper than caterers, but obviously a lot less hassle for you. You can just give someone the job of picking them up on the day. Also you can buy good quality paper plates and napkins in bulk at Costco, which reduces the clear up.
Condolences on the loss of your relative.

Supermarkets will provide you with a carb loaded cheap filling sandwich platters. And crisps and sausage rolls……
If you work on 25 people at £8 per head (£200) imagine the quality of food you could have for even half that amount of money if you did your own, plus I think it’s a nice thing to do for someone you’ve lost. I wouldn’t go near a Morrisons sandwich platter.

Just check anything like sausage rolls or mini sausages are cooked and not needing to be cooked (I think it was Sainsbury’s I looked at once that needed cooking!).

have you a friend who would collect and drop off for you?
id gladly do that for a friend, in fact i would want to

That's why i asked for where and who.

You don’t need a hygiene certificate to cater for your family. Or insurance.

Don’t do sandwiches, they take forever and they’re expensive to make. I don’t know why people think otherwise. I’d make a big dish of coronation chicken with rice salad. The chicken you can make in advance and the rice is half hour work in the morning…..Or a big casserole that can be done well in advance - lots of options and nicer and cheaper than soggy egg sandwiches from a caterer….

I ordered sandwich platters from morrisons for my DGM's funereal but there were only 25 people to cater for so this worked really well.

Ask at the club if anyone is around to open the door for you early for delivery. Otherwise, see my point below and allow them a key to your house to gather up everything and take it.

Have someone organised to sit at the back of the church and leave immediately after the final blessing to go and get stuff organised. You can’t do that because you will be busy chatting/accepting condolences etc.

I was just going to say this, Supermarkets do. Sandwiches, sausage rolls etc it's easy to order and pick up. I can personally recommend Morrisons. You have so much going on that doing it yourself might just add too it. I'm sorry about your grandma

Does the pub let you take your own food in?

As pp have said Morrisons is brilliant, I did my dad's funeral using these, as long as you order in advance I think it's about 3 or 4 days and have the means to pick them up and maybe keep some things cool whilst you attend the funeral it's pretty easy and good quality too. Way better value than if you paid per head if the pub is allowing you to do it yourself I'd say do it . Sorry for your loss.

As other people have said you really need all the food hygiene certification stuff to be doing this.

Food isn't supposed to be out longer than 2 hours for a start, and it's going to be more than that from you taking it over in the morning.

It would be better to get it catered by another company that is more affordable and does better food.

I have catered for a number of funerals because of my job although never a close relative. I usually suggest the timing of a wake to be between lunch and dinner so that you serve tea and cake. If it's around a meal time, order platters of sandwiches from a supermarket. I suggest three quarters per person. I buy fruit but not as much as a piece for everyone. I buy party bags of crisps and serve in baskets or bowls. I have sometimes done quiche, samosas and/or pork pies. I wouldn't suggest you heat anything. Buy cakes. Individual ones mean you don't have to cut them all up. Don't forget serviettes and plates if the hall doesn't provide them. Flowers/tablecloths are a lovely touch.

I would also stick to cold sandwiches/quiche/cheese etc rather than trying to heat things.

Here you go, OP:

https://groceries.morrisons.com/shop-in-shop/food-to-order

https://food-to-order.sainsburys.co.uk/category/sharing-buffet

They all do stuff like this. M&S ones are nice, but expensive and can be hard to get it delivered.

I think if your DGD wants to use the same caterers, you should go with that.

We just did our grandmothers.
Do you know anyone with Costco card - we had sandwiches from there and they were very good.
Then we had crisps and crudités.
Sausage rolls and samosa.
We then baked 4 different tray bakes and that was it.
It was easy and very successful.

Most supermarkets will do platters of sandwiches, then you just buy ready made quiche/crisps/cakes etc. Whatever you fancy.