I've just been obsessively checking various recommended weather sites (metcheck, met office, netweather.tv, weather channgel, xc weather) and, depending on which site I look at, the predicted low for our area on Friday night could be anywhere between 8 to 3 degrees!
Which isn't much help, really.
Not sure how easily I can rig up some fleece round my toms, beans, courgettes - particularly as it will be very windy as well. Can't believe that we might get some frost in suburban London in June! At least I've held back on planting out the squash & sweetcorn, so they can go back in the greenhouse for safety.