I'm booked with some visitors from the US on the 0930 from London Marylebone to Stratford-upon-Avon on 25 April 2011. Chiltern has finally announced their engineering work for that day, and it's clear as mud. The National Rail site has better info than Chiltern's site, but I still can't tell if my train is impacted. I'm guessing the answer is going to be yes, but I can't tell for sure.

They suggest that FGW will be accepting Chiltern tickets from Paddington to Oxford, which I would prefer to buses on rail replacement. However, I have no idea how to figure out which train we'd be trying to catch at Oxford. Is this something that more details will be forthcoming on at a later time, or am I supposed to figure it out from just what's been given so far?

Thanks in advance for any help or advice you can give.