for what it is worth, we were told by our clinic that there were mixed reports out there, and we were ttc for 3 years ( bfp 9d ago) so embarked on a health kick a year ago - right through to zero alcohol and caffeine ( not pleasant) ....so.... we thought we would just not like to have any regrets. I think it's great for someone to actually post that nhs link though instead of just 'what my doctor said- like me'. My wife decided not to have her hair done last week. In the end, I think it is highly personal on this decision, and my wife just decided not to. gl everyone