Help to identifying a type of (British) sword

[Belgian1]

Hello from Belgium, to all members,
Yesterday, in a French auction room I noticed the passage of that seems to be an British sword of the type looked like a model 1831 but I did not know this type of deep carving on the blade, or this type of guard in the shape of S. In addition I did not know if there were badges with a rose surrounded by laurel on the British sword guard.
It was accompanied by a "scarce" Napoleonic scabbard for a An IX sword, maybe it is what made this lot interesting, except if the English sword seems a good model 1831 for you.

Thank you for your opinions and nice afternoon to all