As I sad above, you have absolutely nothing to lose by defaulting your current panel, if it works yay, if not then boo.
Oh, and Texecom won't give a shite about your experience with an approved installer, I expect the approved list reads like a who's who of DIY alarms.
Anything used in line with the job, i.e. laptop, phone etc are a bit naff mentioned in the advert imo, it's as though they should be thankful you don't make them get the bus.
lol, I've also seen lots of inside work to circumnavigate detection, from school kids tampering an IR220 and putting a bit of text book in the lens to deliberate blocking of beams to force a fail to set in a tyre place and cctv proving the alarm was set after the pc was removed and window broken etc etc etc