Hello Chinny and welcome to the forum. On the table alongside my computer is the current issue of the Railway Magazine, open at page 78 and there is an article headed "Chiltern deploys it's former Wrexham stock". The article lists the Loco hauled services which Chiltern are running which includes the 18:30 Marylebone-Moor Street. I'd suggest that this was what you saw or perhaps the 18:06 Marylebone-Banbury. Depends where you were exactly.
Hope this helps.
Regards, 62440.
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