Thank you hmfadopter and withindale. I can see that might be best, but I just don't want a big wrangle with the dealer - I get enough hassle at work and can do without it in something I do for pleasure!
I think there may have been humidity problems in the winter - the tuner (who is also the dealer) mentioned that when he came. What would be the impact of a shrunken wrest plank?
I didn't want to start a great thing with the real wood comment - I'm sure my piano has lots of veneer too, but will be solid wood (of some kind) underneath. As I understand it modern pianos might use laminates rather than real wood in some places - which in some ways are better as more stable.
You have to watch out for really cheap/inexpensive grands on the market these days from Asia. Probably some uprights as well. Not all but there are reports of some makers having used press board cores with laminated hardwood surface. So to look at them it looks like a hardwood laminate or glue up but it has that cheap core material. Hopefully it's only in cosmetic parts !
The difference between some really old pianos, perhaps yours, I'm really would not be sure, is that the soundboards back then were glued up hardwood strips. Today they use a laminated board of hardwoods in most pianos and all replacement sound boards that I know of. However, they are more stable today. The hardwood strips may sound like a more quality item but they can and do become unglued, crack, separate etc. The good news is the impact on sound is usually minimal to non existent. If a buzz appears then there is a problem that needs to be addressed. However cracks in a soundboard will diminish the value of the piano. It generally is a repairable item without replacing though, as long as there is arch left in the frame.
The most common problem with dry to humid and back to dry again atmosphere is the soundboard cracking in the severe dryness of winter if the room hasn't been humidified. That and the pin block dries out, so your tuning pins begin to slip and not hold a tuning. It's normal for there to be a shift in tuning though between seasons. That's due to the simple fact the entire piano swells in the humid weather and shrinks in the dry season, literally pulling it out of tune. It takes large swings though of several months not just a day or two. In the case of the loose pins, if the pin block is good , the pins can often be driven deeper to take on a whole new grip. Or they can be replaced with over sized pins. If the pin block has totally dried up and lost it's resilience or worse, cracked, then it will need replacing and thus be truly unable to hold a tune as the pins slip.
So as another poster mentioned, just what is the state of rebuild is to be considered on old pianos when stated " rebuilt".
Just FWIW, I don't believe anyone is taking you for an idiot ! People come here and ask legit questions that can be taken more than one way, you may feel you were being picked upon, not so sure that was the case.
