In reply to Father Noel Furlong: I've dealt with. company called 'oilchemists' who recruit for the petrochemicals industry... I believe they have a sister/parent company called staffhunt who may be able to tell you more.
Out of interest, why Oil? I'm currently looking at it myself, but as I've primeraly worked in heavy industry then on organic/process chem research, its a no-brainer.