Thanks for all the replies - very helpful as usual.
Neil_A great idea with the claw hammer attached to a stick.
M&C I will use a cut down ladder as well.
However Cybersye - we have a telescopic ladder gathering dust in the corner of our unit. Didn't get on with it over gates. Trying to haul it up from the other side and it telescoping out, getting the thing slightly out of alignment or trapping fingers, bendy and unweildly, etc. Very frustrating.
Will get kitted out this weekend.
Chris