Its all about a few heads down in pompey. The scenes good but as its been said in the last 6 pages the scene is tucked away.
Some people (you know who you are - probably even posted) managed to get the wimbledon park HOF but at the same time the council buffed the skatepark and pretty much banned painting there. There are a few other walls (the one on southsea common gets hit a fair bit, or used to) and there are some spots here and there otherwise near the retail park/bridges and alleyways (quite a few alleyways in pompey).
Otherwise its a) always fucking raining and b) always windy. and all the cabs look like squad cars too - cunts.
NT hook up with SR and SR do most of the stuff around there, so to answer another question i read earlier about styles (straight letter? etc) then i'd say its pretty euro in portsmouth. Theres very little crack and shine/london influence.
The scene changes from year to year but you could hit up pompey in about three hours imho.
Someone else said it though, the train scene is pretty good.