I don't know if that is where the Junkers ended up, it's the only HAA site in the area, but I have never seen anything about smaller AA guns around the Wirral, there may not have been any because we would only get bombers over here and they aren't going to be skimming the trees usually.
Anyway I have found some text referring to the landing site which would indicate it was in the Bromborough Pool area, if I find a suitable map I will post that later.
"I've just re-checked the info you posted on the JU88 crash, and located the spot more accurately now. On the 1:50,000 map I e-mailed you, you will see a symbol, underneath the words 'Bromborough Pool', that looks like a small black spot with a cross on the top; this represents a church with a spire, which I am virtually sure was not there at the time (I'll have this confirmed fairly soon). Go to the right of this church, and you will see a double line, representing a road, which bends 90 degrees to the left, towards north west, above the 'pink' looking rectangles representing a built-up area; none of these were there at the time, and it is in this approximate area where the JU88 came down."
"A little bit more News
. I've been able to look at the Ordnance Survey map for 1948 (the previous one was 1932 I think), and I can confirm that the church I pointed out was NOT there, and the whole area was open at the time of the JU88's crash-landing. The dock area was not as developed, and, when I am able to obtain a copy of the map, I should be able to mark the area fairly accurately."