The Most Expensive Birthday Card

70 year old Joan Hardee got quite the birthday greeting in the mail when she received a painting from artist Damien Hirst. Joan had been Hirst's college secretary, so when her son was planning a surprise birthday party he asked Hirst if he wouldn't make a special card for her. Hirst, though, took it a step farther and sent her an entire painting instead with the words "Happy Birthday Joan" written on it. At the time the painting had an estimated value of £30,000.

Joan Hardee had attempted to sell the painting back in 2001 (rumors are she couldn't afford to insure it) but was unsuccessful, so assuming she still has it how much to do suppose it's worth now?