Update..
As was getting no help from the Supplier i went onto Yuasa on F-book.
Initially they were sounding helpful, but then the Shoulders started sloping, and they've made the Assumption that its low milage use thats the problem based on the MOT history ? .
But in the mean time as a last resort the battery has been on a Massive Snap ON charger with lots of fancy modes, and it been on a high charge then discharge cycle.
Over about 4 cycles its gradually improved to the point it passes a heavy load test.
And its on my Dizzle being tried out.. all seems ok at the mo' we will see if it holds its own when the really cold spells start .
C