Hi All,
i was recently told that the requirements for the seating have changed,something about having to have sliders and bolted to the frame.

Is this the case?

not when i read the latest version of the manual about 2 weeks ago. Download it from the gov. web site and make sure yourself instead of trusting 2nd hand advice.

i read the manual last night (sod all on tv) and I didn't see that, plus my mate is currently doing an atom-esque car which has 2 drilled lengths of flat welded between chassis tubes and uses base mount triton seats which bolt through in a fixed position. He has been back and forth the VOSA station (5 mins from me) the whole build and everything discussed along the way, this was deemed perfectly acceptable, HTH Stott