Hi, this is Worcester, Bosch Group
We have a section on our website about boiler repressurisation which may help you, link is: http://www.worcester-bosch.co.uk/homeowner/products/faqs/boiler-repressurisation/how-do-i-repressurise-my-combi-boiler-with-an-integral-filling-link
Worcester, Bosch Group, September 2010