Hi,
Yes I agree that in the UK a lot of effort goes in to selling Double Glazed doors with hook bolts etc and then fitted with a cheapo 5 pin euro cylinder.
Our Conservitory doors are fitted with Milla locks and the double glazed door linking the conservitory to the house is fitted with a Zone cylinder.
I changed this to a ISEO R11 (11 pin lock)
http://www.m-marcus.co.uk/security/cylinders.shtml with anti drill protection.
My front and back door I went for the Yale Pro Key series which is Patented against Copying, is Drill protected and 6 upper pins and a lower secuirty pin in the key (7 pin in total) which will at least be increase security.
Saying that my Grandad was just burlged in London and they romoved the beading from his double glazing very neatly and took the whole window out!
Hi go for belt and bracers aproach. Good Locks, Alarm and Insurance!!!
Cheers
Jlo