the route (NWP-NMK) involves up to 3 TOC's (FGW, NXEA and poss FCC) so how do you go about buying a ticket - do they have to be bought beforehand? Also, if split tickets were the cheaper option (for one), would they allow you to apply them for the Groupsave as well?
The NFM 02 CD gives the following fares from Newport S Wales to Newmarket:
1 Adult: Off-Peak Single (SVS) £71, Off-Peak Return (SVR) £72.
2 Adults: SVS 2*£71=£142, SVR 2*£72=£144.
3 Adults with GroupSave 3 (GS3): SVS 3*£46.85=£140.55, SVR 3*£47.50=£142.50.
4 Adults with GroupSave 4 (GS4): SVS 4*£35.50=£142, SVR 3*£36=£144.
Unfortunately, there is no extra discount for a 5th Adult.
You can buy split tickets with GroupSave discount for most splitting possibilities on this route.
If you are returning to Newport on the same day, then splitting at Swindon and Didcot seems to offer a saving with Off-Peak Day Returns (CDR), but you need to make sure your trains stop at Didcot as well as Swindon:
1 Adult: CDR £14.40 + £8.40 + £43 = £65.80
2 Adults: CDR 2*(£14.40 + £8.40 + £43) = £131.60
3 Adults GS3: CDR 3*(£9.50 + £5.55 + £28.40) = £130.45
4 Adults GS4: CDR 4*(£7.20 + £4.20 + £21.50) = £131.60
These are walk-up tickets which should be available from ticket offices immediately before travel, but my experience is that it sometimes takes 5 - 10 minutes for the member of staff to find the right buttons to press, so I would buy them a few days in advance, especially if splitting. You can now buy tickets with GroupSave discount online at
http://www.firstgreatwestern.co.uk/Content.aspx?id=43
John