I live down in Essex so my visits are few and far between .... normally when I am up for the football at Old Trafford.
The "Bunting Hide" (?) always seems very good for species at the feeding staion during the winter months including more uncommon birds such as Willow Tit, Bullfinch and Water Rail plus loads of the commoner species.
I also seem to recall seeing Little Ringed Plover in April/May one year and a flock of Goosander in January one year from the "Horrocks Hide" (?).
Unfortunately I can not help with what you are likely to see currently.
This may help ....
Leigh Ornithological Society
I also seem to recall that PMG (Pauline) works/worked at Pennington Flash .... she may be able to help you too.
Richard