In this modern age, Single 13pin Socket with dedicated electrics is the way forward, either fully wired or part wired, depending on requirements, although the cost difference is minimal.
You'll eventually switch to 13-pin, so may as well start now. There's no "single / twin", and the pulgs are much better. Get the TT plug rewired to 13-pin while you're at it.
Sadly , I'm forced to drive shiny new cars as a work perk, so they all come 13-pin. I rewired my FC from twin-7 to 13 and haven't looked back since.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets