There isn't a better place that I know of to view Bitterns, and if you haven't been to Hamm Wall yet, I highly recommend it for everyone. It has good disabled access, all on the flat, despite being a large place and it is full of amazing birds! 

Todays visit with good friend Paul Joy consisted of many great species with Bitterns showing well, Great White Egrets, Glossy Ibis, Cuckoo, Hobby and much much more.  

Disappointed that the day ended with a terrible migraine that I'm still suffering from but still had an awesome time with great company.