I think most tuners would recommend sticking with a major brand SUL on a (especially when chipped) Cossie, but if you insist on saving money then it'd be worth a quick chat and possibly a quick setup/check on the new fuel - boost may need reducing slightly etc. for safest running.

A mate always ran his 350bhp Sapph' on Tesco's SUL as he refused to pay extra, lol. He had no issues that I remember, but I still wouldn't personally.