Hi Crowsnest,
If the password has been lost/forgotten then the device would need a software reset, or re-flashing of the software in order to have it bypass the screen lock. You can visit the link below to guide you to the nearest service centre that you can go to, with the proof of purchase, by just submitting your postcode, and choosing Mobile Phones from the drop down box:
http://www.samsung.com/uk/support/l...Thanks.