Needs some updates

[flameport]

what should I use for this purpose?

If you actually need an RCD in it, then

British General Fortress 5-Module 2-Way Populated Garage Consumer Unit - Screwfix

Order online at Screwfix.com. 18th Edition Amendment 2. 5-module IP65 garage kit. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

and https://www.screwfix.com/p/british-general-16a-sp-type-b-mcb/35253 if the 16A MCB is actually needed.

If there is an RCD / RCBO on the supply to the garage then no RCD required, same unit with a switch only would do.
Or just connect the supply direct into the sockets and fit a couple of FCUs for the lights and door opener.