If you go to a garden machinary centre, you can buy an additive (can't recall the name), it stablise the petrol and prevent it from going off for upto a year.
Not sayig it's all gangs over there, but I suppose if a gang of youth pointed at you from a distace then starts shouting while runnig toward you, it sure will scare the crap out of me.
The slipway at Warsash is gravel with 2 different gradient. The top half is flatter and the bottom half a more user friendly slopier one. Parking is round the corner and is free. The slipway at Hamble is nowhere as good, it's holes everywhere.