How much alcohol for a wedding

[Galliano]

Venue where you supply your own alcohol.
Bar staff and glasses hired.
Wedding in August.
There will be 130 guests. It's not a child free wedding but I don't think there are that many children in the 130 (maybe 10 under 16). There are also a small number of guests who don't drink for religious reasons.
I am urging the groom (my DS) to keep it simple - fizz, wine, couple of premixed cocktails of which one will be pimms, beer.
Googling says allow half a bottle of wine per guest but I assume that's where there's wine on tables and people then move on to ordering drinks from a bar so I think we'll need more.
I'm thinking of at least ordering champagne this week whilst 25% off six bottles offers are around for the bank holiday.
I have no idea how much to get - in total or of champagne specifically.
Any thoughts from anyone?

We did a keg of beer and allowed 2 bottles of wine per person for a 3pm wedding and served a glass of champagne per person for the toasts, it would be awful to run out better to have more and either do sale or return or just store to drink later .

Agree with majestic....great service. We ran out of red wine (guv'nor - it's delicious) had loads of white and sparkly left so returned it. I only drank half a glass of red 😭

I'd say 2 glasses of champagne per drinker for reception, 2 wine per head for dinner, 1 wine and 1 beer per head for after dinner (on basis about half will have wine and half beer and average 2 drinks each). I'd then add on 20% contingency but on a sale or return basis.

If paying for staff I'd get them to top up glasses throughout the meal /toast and serve wine by the glass in evening, don't give out bottles, it'll get wasted (and so will guests!? They have to go to bar to get beer so shouldn't be problem.
Another vote for majestic, I used them for my 50th at home, took about 2 boxes back after and kept some . Guvnor is a great party range borrowed glasses from them and ice buckets , you only pay for what you break

I'd check out Lidl for fizz - their basic Prosecco punches way above its price point. They are pretty good for the rest of the wine too. For beer I'd consider getting a keg from a local brewery for ale fans then stock up on basic lager from the supermarket. Get lots of soft drinks, when the alcohol has finished tough! Perhaps a necessity if there's problem drinkers

Oh and for real champagne we like Aldi or Asda, but to be honest go with the cremant de Loire from Lidl if you want something not Prosecco

We did sale and return with Majestic too.

In the end we had 90 guests (including about 7 children and 3 teetotal adults) and I think we got through about 40 fizz, 35 white and 30 red or something. But we'd bought 40 of each I think, we ran out of fizz. It was a very hot day so people preferred white.

We also had about 150-200 pints of home brew I think, which all got drunk, it was delicious. I can't remember the exact amount.

Also a limited amount of spirits which basically didn't get touched.

Also limited mocktails for the toast, and soft drinks and apple juice. I can't remember the amounts we bought for that.

I did work out the average alcohol units consumed per adult and it was astronomical lol. Maybe the catering staff had a few sips too? The more the merrier