GO Mammoth Netball London leagues are the largest and fastest growingnetball leagues you'll find in London. Why? 1) Our mixed and ladies leagues are aimed at players who are looking to have fun both on and off the court. 2) Everything is provided from 2 professional umpires for every netball game and all equipment, so all you need to do is turn up and have fun. 3) We play at the best indoor & outdoor netball venues in London!