After this initial fustration I rang 123, advised of at least 90 min wait so requested call back. When called back the person advised I can do all this online and to try again. I was out for lunch at the time so not able to try with Spark still on the phone. Now back at my desk I tried again but still the same result.
Rang 123 back again, this time not even advising a wait time, just saying will call back later this afternoon.
Why so difficult to complete a simple speed change?