i'd recommend some matt varnish, and shake it really well! you should really only need one coat otherwise you start to fill in all the nice creases and loose the detail, of course hw purists won't use any varnish.
Thanks for advice,
Did actually use one coat of Matt,
Think the lighting makes them look a bit glossy!
Main reason to seal the numbers after using the other fluids advised,
Do think I got Billy Bremners hair pretty well!