Bongo Fury

It looks like the leisure battery in my Bongo needs replacing as it's a few years old now and not holding its charge. Can anyone recommend a good supplier and/or brand? I currently have a 115Ah which is plenty as we almost always camp with EHU so it just runs the fridge during journeys and the stereo.

Thanks!

I've bought a few from this company and been happy:

https://www.tayna.co.uk/