Hi Serendipity!
I used to go to Hairlounge
http://www.hairlounge.co.uk/home.htm for about 6 years when I was still relaxed. The owner's name is Charlotte Mensah, and she's very nice. She did my hair cut back then, and I stayed with her because she's great at cutting and styling. She's also great at weaves!! I've never been into weaves, but I've watched her do them many times, and she does them really, really well. Her relaxers are £60 (if the price hasn't changed since January). She mainly uses Affirm Lye relaxers. I don't know whether she uses any other. Other products she uses (if they haven't changed since January) are Kereacare, Paul Mitchell, Joico, Mizani (I think).
Gosh, I sound like an advert! Hope this helped you though!