Don't know if this applies to all tescos, but tesco in Redcar had their gardening stuff at knoc down prices...Roundup reduced from £10 to £2, plus lots lof other things too. Worth a look! :)
Yes, is the same where I am. Was in a hurry tohugh, did not have chance to have a good look round, but seemed to have some real bargains.
cheers will have a look there in the morning