I notice you have to fill in a form - I may have got this wrong but it seems that within a year you have to tell the Phills embassy you have got married or you pay an £18 fine!
http://philembassy-uk.org/rom-011009.pdf
At the bottom it mentions the fee.
Quick question if I may?
In the uk how many marriage Certs 'can' you get I recall someone suggesting you get a few done..
Thanks for this
Tone