Gird your loins, lockdown 2.0 is imminent. But, we've been here before, we know the ropes and we're better prepared this time round (sort of). Hopefully we'll be back out the other side in less than a month, but if you've managed to grab a last minute appointment with your hair stylist, these are the low-maintenance hair colours that last beautifully and can see you through weeks (months, even) without needing a top-up. Handy, if you end up joining the back of the queue back into the salon in December.