Go through Evesham, just before the bridge (after the garage on your right) theres a field where you can drive to within 20 yards of the river, there a slip there you can use, cant get a trailer in there because its a locked gate at the top the slip. I just reversed the car upto the gate and unloaded the boat over the gate.
On Poole, i find this is the nearest and most suitable place to launch as well, with no speed limits ( outside of the harbour). I use a launch site near Rockly Park, not a slip but great for a sib with launch wheels, its at the end of lake road, Hamworthy
Evesham slip here