Not sure if this is across all Tescos or for how long -- but my hubby went to our local one today at Westwood Cross, Broadstairs. They were handing out £5 vouchers off electrical equipment at the door!!!!
(Luckily for me - there was also a delivery of a wii fit (just one!!!!) which he used the voucher on). Someone suggested also trying to use the same voucher on toys and games on the same transaction and so we got £10 off!!!!!
Hope this might help someone.
Can't put a link in about this - as I can't find anything online and apologies if someone else has already mentioned this.