what is the latest RCD fuse box and which regulations should it comply with?

Your best bet is to ask an electrician to come and give you some guidance & quote you. Lots of different stuff to take into consideration.

Hi At the Moment its a metal consumer unit (fuse box) with Dual RCD and Main Switch. Also when upgraded your fuse board you need to make sure your SUPPLY is capable. You need to make sure you have at least 10 mm earth to your Gas and Water pipes. 16mm main earth. Either 16 mm or 25 mm meter tails. I would suggest getting a few electricians out to carry out an estimate/ survery

Hi, If you are replacing your fuseboard then British Regs 7671 require a 3rd amendment metal consumer unit to be installed with integral RCD’s or RCBO’s fitted to protect every circuit within the electrical installation. An assessment of your earthing arrangements, earth bonding and condition of existing cable would need to be undertaken to make sure minimum requirements are met before upgrading your Fuseboard.