Wasn't me, honest!
But I did get some shots at York.
60302 Arrival at York


I was pleased to get a shot containing both the loco and the iconic station roof behind.

In actual fact the station was heaving:-
Crowds on platform at York



But I think my best shot was taken as she departed Scarborough on a test run last Tuesday evening:
Scarborough Test Run Departure 23rd Feb.

Looked - Cannot find - Have you a link (please?)

A few good posts above that I fully agree with. The lens aberrations in older glass will be offset by less magnification and many perform well already on APS-C

Shh, can't say.

OK, we'll carry on behind the bike sheds!

FWIW, a solution I was using was to have the 18-250 on the camera, just in case that scoop came along so it would be ready for most things. Then to have a series of limited primes should there be plenty of time to get organised to use them (and if I had them with me!) I also have the 18-55 and a 50-200 kit pair so could have taken that option too but that might still require a lens change. It would be somewhat off topic to list the primes I use, or other zooms for that matter (other than to suggest the 55-300 as a viable alternative in the same price range.)
If one knows in advance what one is going out to take then obviously take the most suitable lens(es.) Perhaps for aviation the 20-40 is ideal.
People have said that the quality of the 18-250mm wouldn't be better than the two lenses Louise presently uses, which I would agree with, but it shouldn't be any worse either and possibly prove more convenient, depending on her intended use.
If someone has had and used a Sigma 18-250 and it fell to pieces or took awful photos then that would be a warning to avoid getting one. There hasn't been a comment to that effect yet.

You weren't wrong in your comment about the 20-40, or at least I'll take your word for it because I haven't used one. But how did that help Louise, the OP with her thoughts about getting an 18-250mm? Have you any first hand experience of those to help her? I certainly wasn't being provocative, just trying to help Louise decide if a superzoom is for her and as I said it is up to her. Throwing in comments about the 20-40 seems a bit of a red herring in more ways than one. At least i do have experience of 18-250mm lenses having two variants and find them no worse than the kit lens only with much enhanced range. But to make it clear, I haven't tried the Sigma variant. Talking about the 20-40 didn't really seem relevant (in my opinion.)

There were quite a few good reports using Pentax legacy glass on the Sony. Weren't some images from the Sony FF with Pentax glass posted here soon after it came out? And weren't people saying if only Pentax was to make a full frame camera, but alas it will never happen!? Oh well.

Yes, they were the K series which preceded the M series followed by the A series, then F series, FA series, FA-J series, D FA, DA, DA-L, DA*, and DA limited.
And all the lenses for sale above are full frame. Great starters for a budget K-1 prime lens collection?

Presumably manuals cannot be produced until the software is finalized. Where would one find details of the UK retail K-1 package two months before release?