I’ve been assured that many locks are “the most secure” but in practise there is little that beats a good pair of lever deadlocks (BS2007) on a steel faced wooden door for slowing entry.

I did a gas warrant (for non-payment, we gain entry and change the meter to Pay-As-You-Go) and they had fitted a new one on me, a high security American deadbolt, not something I’d seen “in the flesh” before. I picked it in under 10 minutes. The warrant officer told me that they must have fitted it specially, to keep us out, as it wasn’t there when they had swapped the electric meter the previous week!

I’d say that the current state of the art would be a Gemini Shield covering a good cylinder like the magnetic EVVA MCS (which graces at least one embassy front door) or a good Abloy (though having seen the latest abloy destroying technique, I’d be more wary) in a Scandinavian format, armoured escutcheons (and hinges) on a well-made composite steel door with a good multi-point hook locking system. Then add an obscure lever deadlock with extra anti-drill protection somewhere tricky.