Which castles have candle light dinners?
I think it unlikely that you would find a castle doing “romantic dinners” – most of them that provide meals do Medieval Banquets which are hardly a quiet romantic evening to propose! I would suggest you spoil her and go to somewhere expensive like Simpsons in Edgbaston but the important thing is that you can afford it – of course if there is anywhere that she has said “I wish we could afford to eat there” go there!