Sue, I had an Endo appointment at a different trust last month.
About a week before the appointment I received a text to say the appointment would take place, as normal (i.e. at the Clinic), unless I was informed a couple of days prior to the appointment.
A couple of days before, I received a text informing me the appointment would still take place, but by phone (and not to attend hospital). Almost at the same time, I had a call from the Clinic to ensure I had received the message, it'd be OK and to check the phone number I should be contacted on.
I had a reminder the day before too.
It might just be too soon for them to know if it's happening or not. Could be worthwhile waiting until less than a week to go?