Blackbrook has an amazingly cheap price for the next three months. Welcome to Blackbrook Zoological Park
Perhaps they are trying the "South lakes method" to bring folk in, from last year , the trouble is that is a very big risk in Blackbrooks tenuous position!
Last year Blackbrook entrance was entirely free in December and January, so it's not unprecedented: https://www.zoochat.com/community/posts/117751