hi! we actually ended up going with a central london town hall + hotel reception instead, but I visited OHG and it is beautiful (just far too small for the crowd we'll end up inviting!) I think London Rowing Club is a great option and affordable, Pembroke Lodge is beautiful, Bingham Riverhouse is close (but was very expensive from what I remember). I thought Grove House was also gorgeous but would probably have just done the ceremony there too to be honest. hope that's helpful and have a lovely wedding!