Any question answered...

I need some new pads for my V brakes. What's usually recommended as the best value for money?

It's for a folder (20" Wheels) if that makes any difference...

I used to use clarks, they're really cheap at sub £5 for pair of brake pads and spare cartridges and fairly stoppy and hard wearing.

How sensible would it be to get some disc tabs brazed onto my IROs steel fork?
i don't mind some extra gussetting on there to strengthen it, but am I asking for trouble?

sensible enough. forks should probably take it fine, but maybe not. consider costs of mod and the risks vs cost of new forks.