Thank you for all your replies,
Having checked the battery today i am going to replace the 140 AH house battery.
I want a direct replacement that fits in the clips currently in place for safety and piece of mind. As mentioned already the existing battery has a lip on the base in which it is secured to the boat. The link below appears to show the exact replacement so my question is has anyone replaced there one with this replacement?
From Tayna 140Ah Bosch 640 036 076
Thanks as always