This site has been around for quite a few years, but I have managed to miss any mention of it before:
http://aalt.law.uh.edu/
An American university has photographed and digitised over
NINE MILLION documents held at TNA.
Probably the most useful for us are C1- Chancery cases.
The images are not brilliant, and there seems no way of enlarging them, but if you can't get to Kew, it's brilliant.