Excuse my ignorance, but flying regularly in this area this does not seem to make sense, just past Shoreham you would not be infringing Solent for another 15+ mins in most light aircraft,
well past Selsey and Nav sould not then have been a problem as even in bad vis the IoW /Portsmouth should have been in sight before reaching Solent. (I
have been out of the country so there may have been temporary restrictions in force that I do not know about - but this does not show on these postings).