Lidls are all about the same size - 4 aisles. If I just need 'to do shopping' it's fine, but if I want specific items then I need to go to Sainsburys - so end up spending equal amounts in both though Lidl twice as often.
Sainsburys for Ecover liquid, low-sugar ketchup, wholegrain bagels and bread, no-sugar peanut butter, aerosol cream, toys for birthday presents, socks, yoghurts, various things like that.
Lidl for most fruit and veg, most ham and cheese, milk, lasagne, pasta, biscuits and cake and chocolate, fish fingers and chips, tortelini, frozen stuff, fruit computer jam, etc.
Hoping Lidl do a fleece in my size again soon - had a fab one but lost it.