SPT / EPT / NPT long names as spoken on R/T are South Point, East Point, North Point respectively. However these points and the TACAN routes are not recognised by IFPS as they are only used by operational air traffic (OAT); they exist in the Mil AIP but not Civil. What’s more the TACAN routes only exist above FL245 in the UK FIRs so if you are planning a low hop to France they won’t be any use (although you can still be sent to SPT etc for ‘off route’ OAT handovers at lower levels).
Personally I find GAT a much easier and more predictable way to get around the continent, not least because it requires much less scrutiny of the Mil AIPs, which can be hard to get hold of. There is a cost-free method of finding an IFPS compliant route: register with
this site and use its ‘route finder’ service: enter departure & destination ICAOs and desired cruise level, et voila!