It's ok Charlie, when I said I was looking for tips, it was a bit tongue in cheek.
Although I was on a pontoon at Cobbs before getting the use of a private jetty at Wareham, I launched and recovered several times. I used to use the slip at Rockley, which must be about the worst for side currents with all the water going into or out of Lytchett bay.
I intend buying an annual pass for the slip at Cobbs, it's only a couple of miles down the road from me.