For a while universities have been converting from the Diploma to the Degree for most allied health professionals courses. The government is making cut backs all the time the same situation is happening with the HE Diploma in Adult Nursing and HE Diploma in Operating Dept Practice. The Diploma courses were funded by the SHA (Strategic Health Authority) and there are no tuition fees but the full degree (BSc) award requires the student to fund the course or apply for a student loan.
There are a few dental schools that still offer the diploma in Dental Hygiene / Dental Therapy e.g. Liverpool, Belfast, Salford etc
And Cardiff is the only place that offers the stand alone Dip Dental Hygiene.
The future is likely to be that the funded Diploma will be fully phased out all together and replaced with a self funding degree. This also means that you will have to apply via UCAS and will no longer be able to apply direct to the university. By 2013 the HE Diploma in Operating Department Practice will be completely replaced with a degree and the same will happen with Dental Hygiene / Therapy in the future at present the maximum tuition fee's a university will charge is £9,000 per academic year. However you will only pay this back at 6.0% per month when you start earning over aprox £21,000 per year after you have qualified for more details on student loans look at the student loan companies website.