So I decided as I started down the skinflint road with the AK I would continue down the same path with accessories. I purchased the AppliancesDirect Divide and Conquer style grill which sells for £39.97 but does not come with the deflector plates. I plan on cutting the deflector plate that came with the AK in half. They had a Grade A option which was £5 less so I got that as I don't care if there are scratches on the grill, its going to be worse than scratches after the first cook on it.
Anyway, I thought I would let anyone who is considering buying this that it is smaller than the advertised 41.5 cmx 41.5 cm. The grill itself is 39cm in diameter and the widest part of the unit is 40.3cm. This is about 1.5cm smaller than the grill that comes with the AK.
I am happy enough with this but there is a lot of wasted space that could be used if you buy one of the Ynni or equivalents.