For those going by train, I expect SWR will run some special services , they are just so slow at announcing it, i remember for the play off final they only confirmed a few days before but ran some trains direct from central to Waterloo not stopping, engineering work might make it tricky but hopefully they can do that again even on diverted route. Slightly longer journey time not a problem when you have a few cans to get through. I've emailed them to ask.