Just been at Duxford/Fowlmere from Denmark via Texel.
Be aware of the "pass your message" fraseologi.
Also you will need to know about "basic service" and "traffic service". When asked what service you require you can ask for either. I asked for traffic service and if that was not available I got the basic service.
The Lars units was very helpfull and not very busy. All of them gave us Traffic service. I had some problems finding them on the map though. The London Info was not of much use.
When returning was asked for the ETA and height of the FIR crossing. We had an intersection on the route on the FIR border. This makes it very easy to reply - just read of the GPS.
You need to know the difference on MATZ and ATZ and the height of both. We are using the semicirular rule but in UK it is quadrantal rule.
Just a few notes on what I found different and noteworthy.