Well that depends really. If the UK found the vaccine we should extract maximum revenue from the rest of the world for it. That's exactly what the United States would do, so good practice for us.
It's just statistically improbable that we would, so yes hedge our bets.
Mismanagement of the virus is likely to make a vaccine pointless anyway. While it might prevent more serious outcomes, it is likely to start to wearing off after 3 months to 1 year (like the flu jab) so it's now a certainty to remain within the global population for years to come to a greater or lesser degree. Great news for the capitalists who thought that the long game was better for economic outcomes.
Previous generations fought wars for years and we couldn't support (as a planet) everyone sitting on their arse for three months. I think that says a lot about us really...