Why don't you subscribe free of charge over the Lidl website to get their weekly offers via e-mail, we do and its great you usually get two per week and know at least a week in advance of the offer starting.
ismisemama, just a word of warning, as you are in Ireland, as am I, the Lidl offers are different here and happen on different weeks too. Just to annoy us I reckon.
I got two of the low energy bulb Osram camping lamps last year in Lidl and they are excellent. Also a couple of cheap 2m x 3m eyeletted tarps, for making quick canopies/covering the camp kitchen/emergency groundsheets etc.
Also from Lidl, though possibly not during camping week, I bought two hang-up fluorescent strip lights with three-pin plugs on the end rather than the usual 12v. They have a hook at one and and are lightweight enough to hang from the loop in a tent ceiling. They give a strong light too, though a bit harsh for my taste. But they are very cool in use which is more than you can say for most electric lights.