Harvey Van Sickle wrote:

Absolutely -- but if you exercise that right to say "sod off" too many
times, they can obtain a warrant. At which point they'll have managed
to see your "sod off" and raise you a "try sodding that off".

At which point you act as nice as pie, let them in (as you then have to)
and take the opportunity to explain just how much time time and effort
they've wasted, to nobody's benefit, and that you hope not to have to
put them through all those hoops again in the future ...