BTW i have a passing recognition of supply/earthing types. Mine is PME
so is it acceptable for me to have an isolator,no rcd and just mcb's?

Provided you wouldn't conceivably use any outside appliances (i.e. you don't
have a garden). The provision of some outdoors sockets with RCD could
support you not providing RCD protection on socket circuits inside. However,
you should realise that you are greatly increasing electrocution and fire
risk by not RCD protecting all socket circuits.

Christian.