According to the link above, the dates have changed (probably to allow access to Hinksey yard for the Banbury blockade 23-31 July) to Saturday 30 July 2016 - Monday 15 August 2016. So three weeks that XC▸ won't be able to run from Leamington to Reading. Bet they're happy.
I think the Banbury dates may have changed too?
From what I've found out there's a 16 day block from
Saturday 30th July to
Monday 15th August to enable three major bits of work to be undertaken. The Banbury resignalling, the Hinksey flood prevention works and also Castle Mill Stream works (by Oxford North Junction).
The works are split as follows:
Days 1-16: Didcot to Oxford closed
Days 1-9: Wolvercote Junction to Banbury closed
Days 1-4: Oxford to North Cotswolds line open but only by using Down Passenger Loop (Single Line Working)
Days 5-9: Oxford to Hanborough closed
Days 10-16: Lines north of Oxford both open