In reply to DEvans:
There's an awful lot of past tense going on here, I thought Joe Brown was still fit and well and busy new routing in various sunny locations around the world. Have I missed something?
Someone mentioned to me a rough rule of thumb for how hard a trad climber could redpoint without any training, I think it was something like "go up one number and letter" from your onsight limit. So if you can onsight UK 6a you can probably redpoint 7b with a bit of effort. Might be rubbish, but at least it's a guideline. So that reduces the question to - what is the hardest techincal grade Joe has onsighted?