Well I called in again today in order to buy a present that I had spotted on Monday when I did the main shop.
Got off to a bad start and things only got worse.
On entering the store a young lady asked If I wanted a £5 off voucher for the clothing Dept.I looked her up and down and then replied "What are you trying to say"

There was no answer just a blank expression so I proceeded to the shelf were I had seen the item earlier, The price had increased by £10.
I left and went down the Asda and bought the same gift using the Tesco voucher for £30 less.

So Tesco lost out in three ways - No sale - Unhappy customer and they paid for the printing and postage of the vouchers.
Ah well not to worry.