2k is plenty for a wedding! loads of under £100 wedding dresses ex sample or second hand on ebay. Go to a bridal sample sale to find what suits you(that way if you do fall in love it's not too much of a budget breaker.
Buy plain tesco value cupcakes and ice them yourselves(Can be the hen party activity a couple days before the wedding)
Rent a village hall type place, fish and chip supper, a lot of chippies do catering and this will be less than 400 for 50 people.
Couple hundred for a registry office.
Photography student, they will just want travel expenses.
Local technical college worth a call for flowers, you might be able to get them for cost only or less.
Half price vista print sale for invitations, or skip them entirely.
You can hire bars for free if there's no bar at the hall.
Ebay wedding decorations and list by nearest first. People will sell their wedding decorations off cheap as they've collection only. I managed £40 for all of ours.
You can make a photo booth or selfie station with pound shop bits and bobs and a white sheet.
It's not easy to do a low budget wedding, it's tough and you need to be disciplined and not buy into the consumerism crap(which is surprisingly tough with weddings) but you can have your dream wedding with very few compromises if you are able to put the time, research and effort in.