I've been planning a small wedding but not yet had my day so can't comment on my choices though I guess it's harder to regret not spending more money than spending too much. Our wedding in total will be under £2,500 - it's basically registry office then private room in nearby restaurant.
I would say that if you want a small wedding be clear about numbers. We started off with just parents and siblings and it's grown slightly - still small (under 20), but I can see how it could just grow and grow. So think carefully and put down rules. We're only inviting aunts and uncles as cousins and their families would just make it too big, as an example.
If you don't want anyone's input eloping is the best way 😂I thought a small wedding would mean less input but I'm not sure. People still want to have their say. And even though it's small there's still a decent amount to organise.
Registry offices can be nicer and offer more personalisation than I realised. We're going to a sweet little old town and the registry office has an amazing view.
You can still look nice without it costing a crazy amount. I got a wedding dress on ebay for 1/4 of its price. Professional make-up and hair are worth it to look good for photos though unless obviously, you can do them really well and it won't stress you out.
My experience as a guest has taught me that if you're having a long wedding day then think about the venue location for guests. Being stuck in a stuffy room in the middle of nowhere can be dull for a few hours while the bride and groom get photos done. Whereas being in a zoo or some other interesting location can allow guests to have a little wander and not be bored.
I sort of agree with others that favours are unnecessary. At most weddings, it seems to just be tat that you don't need. Since I have a small number of guests I could afford something a bit nicer but I agree it is unneeded - I just couldn't help myself. And it's something to consume so not a cheap shot glass or the like.