Bob Minchin wrote:
I have had these in our bathroom for a few years and the hot tap is
dripping. This tap only has about 2m head from the tank and I wonder if
these taps need greater pressure to seal properly. The cold tap is
working at mains pressure and is giving no trouble.

Anyone know?

TIA

Bob
They mostly rely on pressure from o'rings to seal.
may be you can find new o'rings,if they are not specially made.