collis

Listen to your IT guy, failing that try FastHosts (they are based in Gloucester too).
definately move provider to someone else. they sound like their security on the back end is very weak if you keep getting hacked.
Reset your passwords on there too, try something extreemly cryptic, infact ask a local 13year old to write a phrase, it will b33 411 w1r3d l1k3 7h15.