This post was published 1 year 6 months 26 days ago. Therefore, it may well be out of date. Do not reply on the contents of this post being accurate. 
The ‘Tesco Finder’ iPhone app is quite handy.
I couldn’t find the lemon juice so, I typed ‘lemon juice’ into the app and it told me where to find it – and it was right there – aisle four, left-hand side, eighteen along and five shelves up.
Little things please little minds.