OK, so benched this morning concentrating on : vertical arm position at start (meant bringing in my grip by ~1 inch), scapula retraction, flaring elbows out, tension held in the chest, 1 second hold at chest.
It went as follows: 8 x 60kg, 8 x 70kg, 8 x 80kg, 8 x 90kg, 6 x 100kg, 4 x 110kg
At the 100kg and 110kg mark it was chest failing not tricep (albeit slightly so in the dominant right arm).
Very happy with this, I'd say mission accomplished. Thanks for your help guys.