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About to buy an AEG vented tumble dryer and am considering the options
for vertical positioning of the vent outlet through the nearby outside
wall. Am using the Screwfix tumble dryer vent kit.

Two options, low down (30cm) or high up (2.5m) on the wall. The
outside of the wall is onto the street, so I'm slightly concerned
about the possiblilty of small animals (squirrels etc.) getting in
(despite the vent louvres) or kids messing with it if it is low down.

Make a cover for it from some chunky weldmesh or similar. A low vent
with a short duct will be less hassle in the long term.