I'd be very surprised if a bundled router on a consumer product had any sort of VPN endpoint support. Bundled routers are price-sensitive, so providers tend to use the minimum the market will accept.
Google suggests the Post Office supply (or maybe used to supply) a ZyXEL AMG1202-T10A
. The user guide says it has dynamic DNS support for DynDNS only, which is a bit of a nuisance, as dyn.com charge US$30 per year for unlimited service
. Unsurprisingly, there is no VPN support in this router.
In this case, I would check that you can get the authentication credentials and other setup details before entering into a contract, so that you can select your own router. I would budget for buying a router with VPN endpoint support. I don't have any suggestions, as my preferred solution is to deploy a device running pfSense
behind a DSL to Ethernet bridge (such as a Huawei HG612 3B).