Hi. The Government guidelines do not give an requirements on electrics, so you are free to do what you want.
You definitely do not need to fit a TV.
I would recommend fitting some 12v lights to light up the inside of the living space, not just to make it a nice place to sit and sleep at night, but also in case they ask to inspect your vehicle, they will be happy to see some lights inside.
build you own campervan and live the van life