Make sure you check the NOTAM carefully. There's a big TRA covering a whole chunk of the Solent for the Trafalgar 200 celebrations, the Fleet Review, and the International Festival of the Sea.
Solent Radar are providing a crossing service but it's probably easier to avoid it.
You need to look at AIC 48/2005 (Mauve 156), available from the AIS website at
www.ais.org.uk