Having had a look through the new First Great Western franchise agreement (as link to previous) it appears that their have been alterations to the amount of standard and first class seats that will be on the IEP^▸ (Intercity Express Program / Project. This will offer more capacity on routes, save money, give a consistent and safe service and meet customer requirements. Intended to replace HSTs.) class 800s & 801s when compared to the quantities shown in the original draft seating layouts (pages 145 to 148).

A 5 car 800 will now have 290 seats in standard class. This is a 20 seat gain over the 270 seats shown in standard class on the draft 5 car layout. This is the result of a 9 seat reduction in first class seats to 36 seats from 45 shown in the draft layout.

A 9 car 801 will now have 576 seats in standard class. This is a 50 seat gain over the 526 seats shown in standard class on the draft 9 car layout. This is the result of a 30 seat reduction in first class seats to 71 seats from 101 shown in the draft layout, and is the same amount of first class seats as can be found on the current HSTs^▸ (High Speed Train (Inter City class 43 125 units)).

Thank you Chris. I hadn't seen this really mentioned or discussed anywhere, so when I saw it  briefly mentioned on here, I thought I post the details and see what people think of what FGW^▸ (First Great Western) is now proposing.

Didcotdean is referring to the 'Proposed Weekday Class 800/801 Service Pattern' as show in the Government Response to 2014 Great Western franchise consultation (on page 38) which shows the service pattern that FGW^▸ (First Great Western) intends to run after the complete introduction of the IEP fleet in December 2018.

As didcotdean says, there are a number of intermediate stations, including Chippenham and Bath Spa towards Bristol, and Newport, Neath, Port Talbot Parkway and Bridgend towards Cardiff and Swansea, which do not appear on this diagram.

There are a few differences between this calling pattern and the one the DfT had been proposing in the peak and off peak. For those which have not seen this the core service pattern is as follows:

Off peak pattern
1tph to Bristol Temple Meads calling at Reading, Swindon, Chippenham and Bath Spa with certain hour extensions to Weston Super Mare and Exeter St Davids.
1tph to Bristol Temple Meads calling at Reading, Didcot Parkway, Swindon, Chippenham and Bath Spa.
2tph to Bristol Temple Meads only calling at Bristol Parkway.
1tph to Cardiff Central calling at Didcot Parkway, Swindon, Bristol Parkway and Newport.
1tph to Swansea calling at Reading, Swindon, Bristol Parkway, Newport, Cardiff Central, Neath, Port Talbot Parkway and Bridgend with certain hour extensions to Camarthen.
1tph to Cheltenham Spa calling at Reading, Didcot Parkway, Swindon, Kemble, Stroud, Stonehouse and Gloucester.
1tph to Worcester Shrub Hill calling at Reading, Oxford and stations to Worcester with certain hour extensions to Hereford.

Peak pattern & variations
1tph to Bristol Temple Meads calling at Reading, Swindon, Chippenham and Bath Spa with certain hour extensions to Weston Super Mare and Exeter St Davids.
1tph to Bristol Temple Meads calling at Reading, Didcot Parkway, Swindon, Chippenham and Bath Spa.
1tph to Bristol Temple Meads calling at Chippenham and Bath Spa (calls assumed as these stations are not shown).
1tph to Cardiff Central calling at Bristol Parkway and Newport.
1tph to Cardiff Central calling at Didcot Parkway, Swindon, Bristol Parkway and Newport.
1tph to Swansea calling at Reading, Swindon, Bristol Parkway, Newport, Cardiff Central, Neath, Port Talbot Parkway and Bridgend with certain hour extensions to Camarthen.
1tph to Cheltenham Spa calling at Reading, Didcot Parkway, Swindon, Kemble, Stroud, Stonehouse and Gloucester.
1tph to Worcester Shrub Hill calling at Reading, Oxford and stations to Worcester with certain hour extensions to Hereford.
1tph to Worcester Shrub Hill calling at Didcot Parkway, Oxford and stations to Worcester.

The main differences between this pattern and the one previously stated by the DfT off peak is that the Swansea service now additionally calls at Swindon and Bristol Parkway, the Cardiff services now skips Reading running non-stop to Didcot Parkway, and services extended to Weston Super Mare from Bristol are now the one via Chippenham and Bath. In the peak the 2 tph that run via Bristol Parkway to Bristol instead has one running to Cardiff Central running non-stop between London and Bristol Parkway. The other runs via Chippenham and Bath to Bristol in the peak, not calling at any stations between Paddington and Chippenham. Also in the peak an additional service is shown running to Worcester, giving stations between Oxford and Worcester 2tph in the peak, and runs non-stop between London and Didcot Parkway.

The use of the term "certain hours only" is interesting for the extensions of services to Hereford, Weston Super Mare, Exeter St Davids and Camarthen, as this doesn't give as clear a frequency that these stations will be served. This particularly applies to Western Super Mare which in the DfTs pattern was going to be served hourly from London, and Hereford that the DfTs pattern showed as being served 2 hourly from London.