Even in the UK, things that could cause electronic failure
as posted still apply. Need for computer and printer to share
same safety ground. Need for the AC mains to be properly
earthed. Fact remains - overloaded wall receptacles still do
not cause electronic damage. Even if the tenant had to many
appliances on a wall receptacle, that still does not explain
electronics damage. No matter what size fuses were in his UK
power plugs, electronic failure would not and should not be
created. Fuses do not stop or permit electronic damage. The
tenant complained of electronics failures. The landlord
provided no information that explains that damage.

NSM wrote:
This is the UK. Cable sizes are quoted in square mm (probably 2.5
mm^2). Plugs are the UK square pin style with fuses internally.

NM