After the first record of 2 birds on Saturday morning, the number of birds increased to 8 on the same day. 6 were seen again on the Sunday (22nd), and then 8 were reported again late afternoon on Tuesday (24th), roosting together on the overflow at the top end of the middle reservoir. 8 were reported on the Bird Guides website on Wednesday (25th), 7 were reported late afternoon on Thursday (26th), and then 6 were seen by me at 8.45am on Saturday (28th).
Whilst looking at/for the Shags, 2 Kingfishers were again noted (all dates), along with 5 Cormorants (on 25th - Sheffield Bird Study Group website) and 2 Grey Wagtails (28th).
I'll keep checking as often as possible, and keep the updates coming! I'm keeping everything crossed that they stay into December at least, and hopefully, even into 2016!