Thanks pin but there's a high chance I'm about to blow it by messing up this quote function...
Home bias yes but definitely not because I have any view on the UK market potential versus anywhere else. I'm thinking about potential future UK expenses like looking after the folks, kids' university fees, spending at least a few weeks there a year. I guess there's an argument that the FTSE 100 is so international that it doesn't actually track what's going on in the UK (and actually moves inversely to GBP because of that). But the UK house builders, supermarkets, media companies are in there so I think it's as good a proxy as I can get (can't find a FTSE 250 that even accumulates dividends).
You have got me very nearly convinced on AGGG, however! Checking it out now.