Because he's avoiding court. (Pretty sure an offence in itself)
UK bail law:
http://www.cps.gov.uk/legal/a_to_c/bail/
Prosecutors are responsible for determining the charge under the statutory charging arrangements, however the police may nevertheless determine the charge in certain cases, including an offence of absconding contrary to section 6(1) or 6(2) of the Bail Act (see DPP's Guidance on Charging 4th Edition 2011).