NR rail treatment train

I think I caught a glimpse of it from Pinner High Street a couple of days ago when I was coming out of Sainsburys.

I don't have headcodes for the Class 66 RHTTs but I do have times:

Note all trains run as required

Aylesbury dep: 0313
Aylesbury Vale Parkway dep: 0323
Amersham arr: 0402

Amersham dep: 0410
Aylesbury dep: 0443 (via HWY)
London Marylebone dep: 0550 (via AMR)
Aylesbury arr: 0654

Aylesbury dep: 0941 (via AMR)
London Marylebone arr: 1048

London Marylebone dep: 1055 (via AMR)
Aylesbury arr: 1200

Aylesbury dep: 1311
London Marylebone arr: 1417
London Marylebone dep: 1428 (to Acton via HWY)

It ran today (Sunday) with 66019/17, and passed through Pinner Green around 14.45;

www.realtimetrains.co.uk/train/H15393/2013/10/27/advanced

Does anyone have the times of the 'A' stock railhead treatment train please?

RHTT passing Harrow on the Hill today - pictture here - the rear class 66 was even more dirty than the lead.