Is it possible to buy a combined train ticket to Heathrow that takes the railair?

I would like to buy a train ticket from Swindon to Heathrow, changing at Reading to take the railair bus. However the online train ticket services, such as GWR do not offer me these tickets suggesting that I go via London or Hayes and Harlington. I can buy the train ticket and the railair ticket separately from different websites but I am worried that there is a reason I am not being sold the combined tickets.

Is it in fact possible to buy such a combined ticket?

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Can I get a different train to the one I booked?

If you've booked an Anytime Return ticket, then you can take your outbound journey at any time, up to five days after the date written on your ticket. You'll need to return within one calendar month from the date written on your ticket and you can take any train that's available for your route.

Can I use Travelcard to Heathrow?

Can I use my London Travelcard to get the Tube from Heathrow to London or from London to Heathrow? Yes, so long as your Travelcard is valid on the day of travel and covers zones 1-6. Heathrow Airport is on the Piccadilly Line in London travel zone 6, so Travelcards covering only zones 1-2 will not be valid.

Can I take next train with same ticket?

An anytime ticket allows you to return on any train within the dates displayed on your ticket. Advance tickets are the best value tickets available but can only be used for your chosen train on the specific date and time. They are non-refundable and if you miss your train, you will need to buy a new ticket to travel.

Can I use an off peak ticket on a different train?

Off-Peak Return With Return tickets you can travel on any Off-Peak train. For the outward journey this must be on the date shown on the ticket and for the return journey, within one calendar month.

Buying a Railair coach ticket in eighteen easy steps

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Samson Katt, Gustavo Fring, Ono Kosuki, Samson Katt