PN
Not quite true:
From the DTI web site
The statutory holiday entitlement is changing. The holiday entitlement will increase to 4.8 weeks (24 days if you work a five day week) from 1 October 2007 and to 5.6 weeks (28 days if you work a five day week) from 1 April 2009, pro-rata for those working part-time.
That includes bank holidays, though most employers will give BHs as additional days off.