Bibijayne you said
In the UK, unless you have medical grounds for it, circumsicion can only be carried out by a registered rabbi or Iman.
My BIL and his wife (currently TTC) were having the same debate. She's anti, he's pro because it's easier to keep clean. When he realised it cannot be done by a doctor in the UK unless there's medical need, he changed his mind and they now won't circumcise.
May I ask who told you this? This is untrue. In some areas of the UK you can get a referral from your GP for boys to be circumcised in an NHS hospital under GA at around 1 year old, even without medical need.
There are also private clinics where the practitioners are trained doctors/surgeons and the procedure is done under LA. In the one we used a letter was sent to our GP from the clinic so medical records could be updated. Some clinics specify only infants under 3-4 months old, others will do it for toddlers. It depends on the surgical technique used.
Both NHS hospitals and private clinics will carry out assessment to ensure the child is fit to undergo the procedure and that it is in their best interests.
I think you should check this online and let your BIL and his wife know so that they make a fully informed decision. However, if she is firmly against it, then neither the NHS nor most clinics(if any) will perform the procedure without both parents present to sign a consent form.
I'm not sure about the exact situation in the Jewish community but I have not heard anything about Muslim imams getting trained to do circumcision. An imam is someone who leads prayers, some of them might be trained but from my experience in the Muslim community it is usually done by doctors/surgeons who are not imams.