Melanie,
Thanks very much for replying - I'm really grateful.
Yes, my husband has unpleasant memories of having to stand for hours on a train in August. I've only managed to convince him to be brave and trust me that I can book a seat. Ahem.
I've discovered, with The Man in Seat 61 website (much easier to understand than Trenitalia) that some tickets will have to be purchased via an agency. and that for my return dates I will have to wait 10 days for the tickets to be released as none can be purchased 60 days in advance.
If I cannot book an IC train and have to book a regional train, will I still get a choice of 1st class and will there be air con, or not? Anyone know? August is a tiny bit hot, you know!
I'm going to phone a UK based international rail service and see if I can get some advice.
Any help welcome.
Thanks again.