Hi Ellie,
You've had some great advice already, but I just wanted to add that I also had problems like that in the first couple of months, and nearly gave up several times :cry: .
I know I would have done if my hv hadn't recommended KAMILLOSAN Cammomile cream for sore nipples. As you're in the UK, most supermarkets sell it (yellow box, white tube, in the baby aisle next to gripe water, etc). It must be put on AFTER every feed, and thoroughly cleaned off before feeds (as another hv said it can cause thrush :roll: ) - I used baby wipes. You also need breast pads as it can be messy (Tommy Tippee are the best). I had to persist with it, and used it until my lo was about 3 months, but like I said, I don't think I could have carried on without it.
Take care, hope it works out,
Caroline