Before you get too excited about landing at Battersea, do note that a quick stop/go there will not leave you much change from £500.
A "hot" turnaround (15min slot land & go) for a R22/R44 is £305+VAT = £366; then add another £100 to bump your helicopter liability insurance cover up (for one day) to their required £15million which your helicopter will most likely not have by default.
And don't forget the instructor/safety pilot required for the first trip who must be Battersea current and the tower visit you have to make to be approved for Battersea ops...................
SND