India Knight (the author) dedicates a chapter to this in her living thrifty book (not 100% sure what it was called but something like that!) lots of good ideas!
We only invited immediate family - as in parents and siblings to our wedding and the wedding party so only 20 people total. It was intimate, just what we wanted as we wanted the day to be ours and not feel obliged to get round seeing everyone.
I understand its much smaller but we got married at registrar office and went to a nice restaurant after.
Bought dresses for me and bridesmaids on wish (did it with loads of time to spare so we had time to sort something else if they turned up awful) they were perfect and cost £136 total
Made to measure suits for groom and best man, again ordered from overseas, no problem £100
Took our own cars, my mum drove me in ours.
Ordered £40 gypsophilia from Holland and made the bouquets and buttonholes. Made confetti to hand out by drying rose petals from the garden in the oven.
No drinks, just provided food.
Asked everyone to take lots of pictures and shared them all on a WhatsApp group.
No cake, we went on honeymoon straight from reception and dessert came with the meal anyway.
No favours, we asked for no presents and bought everyone's meal.
I wouldn't have changed anything and have no regrets from the day. I would have been regretting if we'd spent ££££ though. It's just one day, the marriage is the 'big' bit.
Hope you get there and have a fantastic day!