Can't really see the point in them starting again on-line (although it is really Shop Direct who have just bought the Woolworths trade name). There are already plenty of established on-line stores and websites that they will have to compete with - and to be honest they have not got anything different to offer.
As for the Pic 'n' Mix - can't see the point in doing it on-line. You can get the same sweets from any shop or supermarket without having to pay £1.50 delivery (if you spend under £5) and waiting for them