I’ve always considered Opus One as a place to go for a special occasion, a treat if you like. And I’ve treated the odd lady to the boudoir style dining experience – a setting that wouldn’t feel misplaced in Amsterdam’s red light district.  A meal for my mum’s birthday therefore was no exception (to my treating a lady, that is) and so I booked a table in November. Her birthday is actually in July, but she likes to milk it like you wouldn’t believe (we’ve been celebrating her 50th for the best part of eight years).