WonderWoman:
Absolutely true

Tesco in my experience have always accepted the vouchers even though with the offers your bill is under the min. spend required. However there seems to be quite a few people recently saying that the vouchers are being accepted at checkout and when their shopping is delivered Tesco have refused to accept the money off voucher as the min. spend has not been met.
Having experimented with this a little, I have found that so long as your total spend online is over the threshold for the voucher, then the voucher applies and is automatically used.
Bear in mind that the online total does not take into account any BOGOF's as they are only calculated and deducted at checkout time, so if that brings your total below the threshold it makes no difference, the voucher is still applied.
That is exactly what happened to me on yesterdays delivery so it is current information..........