Try using dishpointer.com. Type in your postcode, or local town, select 28.2E, Astra 2, from the drop down satellite box, then zoom in on the map, moving the green icon, to your house, and roughly where you have your dish sited, then check which way it is pointing, and use the show obstacle option to see if the tree is high enough to interfere with your line of sight.
If possible, try a temporary install somewhere clear of the tree :O) save the cricket. See attachment, testing placement to get 28e reception in between trees in south france, kept it for some time and worked fine (later got a little larger\better dish properly installed at the chosen location).
I want to thank you all so much. Positioned dish other side of caravan, small gap between trees, used website as suggested, positioned using compass, and bingo received signal even on small sky dish. Now son is happily watching the Test cricket, calm is restored.