Have managed to dig out the amended timetable for Southbound services on Sunday 24th January 2010.
As follows...
Departed Wrexham General at 10:47, 13:11 and 17:02.
Called at Ruabon, Chirk, Gobowen, Shrewsbury, Wellington, Telford, Cosford and Wolverhampton (set down only). Not much change to the regular Sunday timetable at these stations.
Final call at Tame Bridge Parkway at 12:26, 14:55 and 18:54.
Diverted via WCML (as far South as Willesden (?)) and so didn't call at either Leamington Spa or Banbury.
Arrived Marylebone at 14:52, 17:53 and 21:44.
(Normally would have been 14:36, 17:08 and 21:06 arrivals at Marylebone if routed via Leamington Spa/Banbury, as per the public timetable effective Sunday 13th December 2009).
Hope that helps.
Sorry, don't have the equivalent Northbound amended times.
