I have an interview on Friday 18th of May could anyone shed some light on what non oppressive practise is, and have you any suggestions on any reading materials in preperation for the interview?
I would be very grateful for any advice given

check out this website
http://web.uvic.ca/socw/bswadmit.htm

Anti-Oppressive Practice: Anti-oppressive social work practice seeks to empower people who face oppression due to issues including, but not limited to sexual orientation, race, gender, age and disabilities. As a result, the social work relationship is one where the practitioner draws upon the lived experience of the client. Inherent power imbalances present between the practitioner and client, as well as within the client's life are examined. For further reference, you may want to search the internet, under "anti-oppressive social work practice" or other related headings.

Books you might find helpful to give an overview of want Anti-Oppressive Practice is include:
"Anti-Discriminatory Practice" - Neil Thompson
"Anti-Oppressive Practice" - Dalrymple & Burke