Thats good cheers hotrod,
I see the TRADA span is 100mm more than the 1992 building regs part A table for the dead load cat of .25 - .5 kn/m2 infact its nearer the dead load cat of -0.25 kn/m2 which is 3.10, out of interest does TRADA have the specs for 97x75 joist so I can get a rough...