A South African company will treat Oxfordshire eye patients in a controversial mobile unit due to be launched next month.

But Oxford MP Dr Evan Harris is still campaigning against the service, due to visit Banbury and a town in the south of the county. Doctors fear it will take work away from Oxford's Radcliffe Infirmary.

Health secretary John Reid pledged that thousands of patients would receive quicker treatment thanks to the mobile units run by Netcare, which has won the contract to perform cataract operations for the next five years. The mobile service will stop at 80 locations across the UK every three months.

Dr Harris, the Oxford West and Abingdon MP, has reported the scheme to the National Audit Office, claiming the Government fiddled the figures to make it look as though Netcare could provide a cheaper service than the NHS.

He said: "The Government has only been able to cobble together this by moving patients out of the RI, where they have good quality care, into mobile treatment centres of unknown quality."