I suppose you need to allow this much time in case of delays on the 1st leg. Without through ticketing and in the event of a delay on the 1st leg, meaning you miss the 2nd leg, I doubt there would be much sympathy given.
Providing you allow the minimum connection time, you're covered. However it can be a good move to allow more time, particularly if you want a break for food.
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If you have a Virgin Advance from Euston and miss you're train and say it's because the FGW service was delayed, which you had a different Advance ticket for then I don't think the Virgin staff would 'let you off.'
They have to abide by the Conditions of Carriage! They have to allow you to travel if you are on a valid combination of tickets.
Virgin should ensure that, for the avoidance of doubt, guards are instructed to allow travel in the event of delays to an earlier leg on a customers' journey. As Virgin are not covered by the Freedom of Information Act, I can only assume/hope that they have done so but am unable to quote it.
However I can quote this from East Coast:
Advance Purchase ticket(s) – when to accept on
EC trains other than the one shown on the ticket.
In the last few issues of PTU there were articles
about what tickets and when should be Advance
tickets be accepted on EC trains other than the one
shown on the ticket.
For clarity the definitive answer where a customer
has split tickets, e.g. a Harrogate<>York and a York
<> London ticket, and the Harrogate- York train is
late, the York<>London ticket should still be
accepted on the next available EC service.
Also, I have confirmation from ATOC that combinations of tickets do cover the customer for their entire journey, subject to the minimum interchange time being allowed.
We've been through this several times before, it is valid, you are covered, and in the unlikely event of anyone being charged a fare under such circumstances I would encourage them to refuse to hand over any cash up front, obtain an unpaid fare notice, and contact me for assistance.
Indeed, this did happen to someone who contacted me for assistance. The guard (who is extremely well known on the EC route for being "desperate", but I'll choose not to reveal his name!) was given 'suitable advice', and the customer had their unpaid fare notice dropped, and a reminder issued to staff that such combinations are valid.
If any other guards want to be on the receiving end of suitable advice, then that's a bad choice by them! Very, very few guards would attempt to charge a customer for a delay on the Railway. Those that do, need to be dealt with so that they can stop giving the vast majority of guards - who do a good job - an undeserved bad name.