I didn't go there in the end, I found that the Halfords set I already have goes up to 19mm, for some strange reason I thought the biggest were a 13. I only own one item from Snap on, that's a spanner that I found out in the street, lucky find that.
I guess that most of my tools are middle range, Halfords professional range is rated highly by certain mags, I've not had any problems with their socket set any way, although I'm not using them 24/7.
I personally have not had any tools from Lidl or Aldi break on me, for the price I don't think they are bad at all.