Pete – might be worth seeking out a slightly longer but lighter custom board. NSPs and Bics are okay but they are heavy and flipping hurt if they hit you. They are also next to useless if you progress further.
My wife has an 8ft "glide" (made by Bunty) which is sort of a small longboard that's stable enough to progress on but turns enough to do "stunts" – I've had reos and floaters on it – very hard on an NSP/Bic.
Much as I hate to say it, there are many Chinese made "custom" (by that I mean foam core, resin skin) board going for around £200 or pick up a nearly new "named" board for similar money.