I see nothing wrong with Lidl, there's some very nice food there which you can't get anywhere else...
But as for the chokky blocks, haven't a clue, if one was loose then one side would have fried and the other should have remained ok, but it hasn't, I personally think that they weren't rated for the job and overheated causing the damage as depicted in my photos...
I haven't gotten the radiator any new chokkies as I want the really big chunky ones, so no, it's not working again yet...