Can't help with Cov but if you don't mind coming to Leics my mate works at Car Audio Centre and I can vouch for his work. If you ring them ask for Chris and tell him Renny recommended him.
hi ya why not trie steven at auto audio alarms he does do moble but he is just out side solihull in b,ham his number is home 0121 430 8810 and mob is 07818 842479