I will hold my hand up and will admit that I've made a control zone airspace bust.
Was departing out of Bembridge enroute to Cardiff via the coastline along Bournemouth.
Climbed up to 3000' and when I called Solent they were waiting for me to call... I was 1000' into their zone but there was no problem and I was cleared through the zone at that altitude anyway, beats asking for it.
They didn't report me, or even ask me to call them on the telephone as when they told me I was in their airspace and I was cleared through I did sound rather suprised (which in fact I was!), looked at my chart and explained what I thought happened - only took twenty seconds or so and the frequency was quiet.
So I am very thankful to the controller who was on duty on Solent Radar that day a few years ago. Never done the same thing again.
On the subject of Solent they have always cleared me into their airspace at various levels, both before and after the incident, usually via SAM without any delay whatsoever. I have nothing but good praise for them... never had to duck under their airspace but have had a plan of action ready anyway. Staying above 3000' does help though, it seems.