Not as stuck as you think
Use an RCBO like the one below and replace your lighting circuit's MCB with it.
http://www.tlc-direct.co.uk/Products/MK6932.html
You obviously need to get one compatible with your consumer unit.
Use an RCBO like the one below and replace your lighting circuit's MCB with it.
http://www.tlc-direct.co.uk/Products/MK6932.html
You obviously need to get one compatible with your consumer unit.