Sorry. It's a specialist job. Lead and Light in Camden North London http://www.leadandlight.co.uk/ DO mend leaded lights. It's expensive though. A lovely new camefix panel will be cheaper!
I am the inventor of Camefix and the ONLY artist making camefix lightscapes. CAMEFIX is an innovative new way to make decorative glass panels for doors and windows using wood and adhesives, instead of the more usual lead and putty. The panels can incorporate 2-way mirror film, coloured film, and crystals to make rainbows that slide across your walls. Camefix lead-free leaded lights are cutting-edge art.