I use BP ultimate. I have heard so many bad storys about tesco, an RAC guy i know filled his van with diesel and it wouldnt even start after cause there was water in it.

Another guy has 2 vans for his work, both filled up the same day in same tesco station and both broke down that afternoon.

One of my friends used normal not BP diesel and used tesco diesel once and the van was 10 MPH slower top speed lol.

Shell pulled out of N.Ireland and Ireland and they all changed to BP's over here.