My family and I will be visiting the UK in August. We're going over for a wedding and will be staying in Bedford most of the time. We will be going to London for two days, 8/19 & 20. While in London, I'd like to take a few hours for myself and visit a really good photo gallery. I'd like to see some work of the masters. I don't really care about modern inkjet artists. I want to see good traditional work. Can anyone suggest a few galleries or museums where I could find this sort of thing? Thank you so much.