Hi Haydn,
Roundhay Park is only down the road from me and I regularly walk the dog around both lakes. Must agree with you as I haven't seen much come out of there lately.
I haven't seen any comorants but have seen three fat herons regularly perched on the wires.
There was a large head of skimmers put in there by Leeds ASA a couple of years back which seem to have dissapeared along with the large head of roach that used to be in there.
Dave