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I used to play all day in Preston Park, as soon as I was old enough Patsy. There used to be a brook/stream running through it back then, that us kids to play in ( when the Park Keeper wasn't looking ! )
I was there about 15 years ago and I notice the the brook/stream was covered over and diverted into a pipe.
My Mum used to play tennis in the Park as well. I went to the local Cub Scouts that had their hut down some steep steps alongside the Tube line, on the opposite side of the street from the Tube Station.