Suddenly this supervisor comes on the blower and says "Callsign....do you have a navigation problem"....to which we replied "No", then he came back all condecending and said "you have just infringed an active danger area".
That is quite incredible. This is a radar control environment. London Control are supposed to know about notams etc. IFR traffic in CAS is not responsible for avoiding danger areas and 99% of pilots in that airspace would know nothing about them.