If you have a serious amount of spare cash, I would recommend you buy a painting by Ron Kitaj (above with his wife, Sandra Fisher). Kitaj was one of the late 20th Century's best painters, and your investment would do well.
His wife Sandra was also a very good painter, but not as commercially minded as her husband. She allowed things to follow a natural course, whilst her husband became a super-star.
Below is her painting 'Chess Players'; a deceptively simple composition, well executed, which would sit happily in anyone's home.
They were both around when I was living in London, and I rather regret that we never met. We may well have been in the same room together on occasions, but I wouldn't have known who they were.
There may have been one photo of Kitaj in Snowdon's 'Private View', but nowadays, with the net, we have photos on hand of just about everyone; so no excuses not to recognise.