Browsing Youtube, I came across someone cooking on what appeared to be a Weber grill, but with a neat 4 section cast-iron grate. I decided to track it down, out of curiosity, and was delighted to see that - for once - it is something available in the UK, apparently from a german manufacturer.
As it happens, I am not going to buy one at this point - I'm about to go pellet, so am not going to buy anything new for my kettle for now - but I thought others might be interested in the grate and the optional griddle section.
http://www.cast-iron-grate.com/
Chris
(Apologies if this is something you guys already know about - I did do a quick search, but didn't spot anything)