Clos maggiorre...yes, v romantic even if you're not in the conservatory,
But if you are happy to go out of london then definitely 100% manoir...
Tasting menus with matching wines to make it extra special at either place... Ask fir the 1928 port in clos and don't have a big 3 course lunch before dinner at manoir (I honestly thought I would burst that day!!) I even had to have the husband finish off some of my food/wine... He gladly accepted!!
Have an amazing time 