I suspect that the house does have earthing and what you have is a loop in loop out system where there all the connections are in the ceiling rose and its just a live in switched live out at the switch and because they didn’t need to earth the back boxes as they are on wood they simply cut the earth wire in the twin and earth short.
Take one of the switches off and pull any slack cable thru – I bets its twin and earth with the earth cut short. split the outer insulation off and you will find an earth – shorten the live and switched live and then you will have an earth available.
No earthing would be illegal would it not in the UK?