Thanks for the reply!
ADT have included monitoring, maintenance, parts and labour for there monthly cost of £35.00 (GPRS System). They have said i own the kit after the 3 year contract.
Smaller companies have mentioned about £20-35 but this is with a CSL dualcom system. They include a 2 years manufactures warranty, and two maintenance checks per anum and have put in writing if any equipment fails within 3 years they will replace it as they are confident with their work and equipment used.
Insurance companies have stated ideally a minimum grade 2 system is required. My confusion just lies in what would be better and secure ADT with GPRS or Independent with CSL dualcom?
Once again thanks everyone for the help