Hi Pando

You could command from £35k - £45k dependant upon experience.
Obviously contract will be more. Although you will be subject to UK IR35 tax code, which means that you will be taxed the same percentage as a permanent employee

If you go to http://www.jobserve.co.uk and search 'oracle dba', you will get a list of about 600 positions currently available in UK, with varying salaries and skill set requirements.