Thanks everyone for your input. I had my first consultation with them on Friday. The guy I met, Justin, had the treatment. It looked pretty good, I even made him come out front so I could see it in direct sun. It may be that because he has gone for a light shade that it works well... Would need to see someone with a darker version to be certain. Justin had his treatment a few months ago and said that afercare was important.. much use of creams and balms.. and he needed to avoid direct sunlight for 5 to 7 days. Still seems like a small price to pay.
As for anyone running their fingers through it... I will be honest and say it has been over ten years since anyone could do that with me anyway.
I have gone away to think about it with a view to going back for a follow up consultation in a couple of weeks by when I hope to have clarified my questions for them... your contri's here have been a huge help so lease keep them coming. I have certainly picked up on the importance of getting the hairline right.. it sort of defines the overall outcome as good or bad - not completely convinced yet but the practioner spoke to me about "bevelling" the edge which would give it less of a stark appearance... I dont want to end up looking like a hop hop wannabe now do I?