ck4707, thanks for your comments on PC World. Cannot find Lexmark 7200 compatibility for their "own" brand on their internet site, but for HP 700,800, & 1100 MX2(see previous post) are only £1 more expensive that PCW own brand for HP original! Also MX2 have no UK shipping charge during May(normally £1.95).
PS - I don't work for MX2!