London-based burglar alarm installer needed

I am looking for a burglar alarm system to be installed in a medium sized property with 3 bedrooms. I already have most of the necessary equipment, I bought it with me from my previous home and want to reinstall it here. I have a scantronic ion-40 panel and various wired and wireless detectors. I also have an Elmdene wired external sounder. Looking for a freelance alarm engineer (only) to do the install for me. Thanks.