Sir PhilPamAndRob: Called in tonight and I can confirm the cache has vanished.
It was behind the noticeboard on the right as you entered the park, in a corner on the upper ledge. This noticeboard has gone!
There is a new Welcome noticeboard on the other side of the path, but it doesn't have a similar ledge, plus the angle it is at means the back is in clear view of everyone exiting the park.
As a result, I've decided to archive this cache. Thanks to everyone who visited it, and good luck to Everton in the FA Cup Final
Cheers, Phil