In article ,
James Salisbury wrote:

I am looking for a supplier of good transient suppression
equipment and a overvoltage protection unit. My parents are
living out in a rural part of spain and are having problems with
the mains killing electronic equipment.

See what Watford Control Instruments, have to suggest,
http://www.watfordcontrol.co.uk afair.

Not cheap, but your problem isn't cheap anyway.

--
Tony Williams.