Issue of UK CPL based on EASA CPL

[vp89]

Dear all,

I am planning to train as a flight instructor with a British ATO. I am currently a holder of EASA CPL with ME/IR. Please, correct me if I am wrong, but I understand that to fly a G-registered aircraft as a FI I (will) need a British licence. So, what is the process to get a licence based on current EASA CPL (issued in 2013)? Have you recently gone through this (or vice versa) process?

1. Do I need a British MED Class I certificate or could EASA MED Class I certificate work for just now?
2. When applying for a British licence, do I need to pass any exams or proficiency checks?
3. Do both ME/IR transfer into a new British licence?

I went through the regulations previously, but still have the above questions. Thank you for your answers and clarifications.