You near Liverpool? Have a look at the list on this site, otherwise someone local , one problem is some companies want contracts or not interested so you need maybe a house basher local to you , must be someone advertising locally , although not all may use galaxy
Better to go seperate
Some intruder alarms can send snapshots
Better to have 8core imo
Run a cat5 to every CCTV point next to the rg59 it will prove useful later and it's cheap enough to do
And where ever you might want a camera later run an cat5 there to , you might only want three cameras now but 10 in the future might be nice
You will have a fair amount of trouble with this panel , better to get an engineer out who knows it well , they can reset all codes for you aswell , that will be the first thing