I too am "old fart"
Same kind of demographic as you, but live in Sheffield (top 3 area for car crime
)
Mine was £520 fully comp, no claims protected through Adrian Flux. If you are a member on UKMKIV's they do an extra discount too. 
I'm currently with AF on my modified Mk3 and modified Fabia vRS...and they have given me a decent quote - but want a Cat 1 alarm adding - sod that!
The quote is good - similar to yours, which bearing in mind the value, is spot on. I just don't want to have to add further alarms etc.
I didn't have to on my 911...why on earth they want if for a Golf is above me.
Did you need to add anything extra, security wise?