Pop , mine is coded for the Solent, i can tell you exactly what you will need to do
1) Portsmouth have a web site with all the info on there, there is a check list to follow, providing you follow (e.g all the bits) then you will be home and dry.
2) In the past they would give you a licence with exceptions, now they want to have proof of these before they issue. e.g last year had an exception of a liferaft, basically saying that when in use it must be there. This year they will issue one once they have seen it, i have it so it makes no difference.
It not difficult to do, just need a little time and some money with you when you go to the chandlery