Hi Nhop 79 and welcome to the mad bad world of PHO

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Sadly i don't live in Norwich but i found that if you ring a hairdresser's before you go and explain about your P you can pretty much gage whether they will have a problem with it. If thats the case you just keep trying till you find one that is okay.
It took me ages to find a hairdresser that was okay with dealing with a person who had scalp P and i have stuck with the ever since. My hairdresser has a brother with P so fully understands. You may be surprised that most people know about it., and wont treat you like a leper.
Dont give up hope if you get a negative answer its their loss. Just keep trying.
Good Luck and keep us posted.
Md