Update. After 6 phone calls to Learn Direct, helpline and technical department, nothing had changed. Admittedly this was not helped by me, when they phoned me, I thought it was a sales call and said 'no thanks', putting the phone down. Yes I did phone and apologise.
I then discovered I could cancel the two bookings myself, but the system warned me that I would loose my free entitlement. So I cancelled 9 days after the scheduled date. I lost my free entitlement even though the tests were actually cancelled by the test centre the day before.
I have now finally rebooked. There are no dates for my home of Portsmouth, There is one time slot for Southampton 20th December, had to book other one in Slough 29th December, but Slough only offers the Literacy tests. It is not possible for me to book a test centre for both on the same day before 14th March and that is in Swindon. This is just ridiculous!
It is clear to me that Learn direct is not capable of providing this service, and I think it should be given back to Pearsons to manage.
I am just waiting for Southampton to cancel the day before, as they are the same franchise that runs Portsmouth! So wish me luck, not with the test, I am just not convinced it will take place.