IIRC Ceefax attributes some towns to nearby stations, e.g. Salisbury is
Boscombe Down.
I suspect this is what's happening with "Bolton" but I'm not sure which
station it would be.

Ceefax p404 does that, yes, as do many newspapers ("Shrewsbury" is
Shawbury), I suppose to give familiar names rather than those of
airfields which mean nothing to so many. I've never seen Bolton (or
something claiming to be Bolton) on that page though.
On 407 you often see places that never appear on 404, I expect they get
that from both the 404 sites and other sources.

Edmund