A few weeks ago I heard an interview on Radio Sheffield about 'Hullaballoos'. This is an indoor play centre with ball pools, slides, climbing structures, bridges, and much more. They do play sessions in which children of ALL abilities play alongside each other. You may need to ring them to find out further details on 0114 284 8921 at Pack Horse Lane, High Green, Sheffield, S35 3HY
There is the website link but the beurocratic 'red tape' on this forum website requires that I make at least 5 posts before I can include a web link in my posting.