You will want to take note of the
train strike planned for 6-8 August. This is on East Midlands trains which have the monopoly on the Midland main line from St Pancras to Sheffield, via Loughborough, Derby, Retford and Worksop.
We are heavy users of these trains at work and in the past, strikes have just meant very crowded trains with no seats, as they still run, but there are fewer of them. There's also an option to adjust plans and use the east coast main line. I'll check out any news on this as we will get updates at work.
I also read some incredibly complicated stuff about what is going to be shut/chaotic during the Olympics in London - we are sent info that the general public don't get, only employers. If anyone has any particular plans involving London, post 'em up and I will check this out next week when I'm in the office.