EV Charger Questions

Hi,


I am planning on installing an EV charger for my own home and have 2 questions. 


1) Can an RCBO with a B curve be used for EV chargers, as I am seeing a mixture of "C" and "B" between different manufacturers - I have called Pod Point who are worryingly unable to give this information. As MK have apparently stopped with some of their switch gear business, I am struggling to find a C curve type A RCBO at 40 amp but can find plenty of B curves (hence this question). 

2) If I need a C curve, I have an issue in that the current CU only has 2 spare ways (bad design by the previous installer!) and I cannot install another DB as this would look very ugly, therefore to avoid mixing manufacturers inside of the consumer unit, could I have a C40 feed a separate enclosure that contains an RCCB rated at 100amp, with an A characteristic - therefore the MCB would feed the RCCB which would then feed the EV charger - generally the RCCB goes before the MCB, but wanted to check there wasn’t a non-compliance to 7671 as a result of doing this?


Thanks.