Hi,
I imagine you have your answers by now, but here goes;
I'm registered & insured to carry out mobile body piercing.
I'm Bristol based, so my experience may differ to your own, rules vary greatly between councils.
I called the local council switchboard & asked for the department that deals with cosmetic skin piercing (the same dept that also deals with acupuncture etc.),
a visit was arranged where my set-up was checked, we had a talk, he gave me permission to go ahead, charged me an arm & leg & left. That's it.
If you absolutely know your stuff, it should be pretty easy.
He was the same man that gave me my licence to pierce in the salon.
Just call your local council & ask!
Good Luck. x