A few on here use Halfrauds oil and don't seem to have a problem.
Personally I've not had much experience with different oils, the last oil I bought was Mobil 10w-40 @ £25+ (which I think was too thin), this time I've gone for Titan uni diesel 15w-40 (don't wanna blow too much £ on a possible duff engine). I used the Titan stuff on my last Golf and it seemed fine, and it's quite cheap @ under £15.