Lardman - it's a real pain when your BNS don't ripen, or even set for that matter, and over the last few years I've had both problems and have yet to pick a ripe fruit.
This year was going to be my last attempt if I failed again, but the Harrier F1s are ripening nicely, and they are bushy rather than trailing so take up less space. Something to consider tof the future perhaps?
SS