The BBC Sounds catch-up service on Humax's Freeview Play does seem to be working properly on my FVP5000T. To identify if this an exclusively Humax problem could someone with access to another device, such as a Smart TV, see if that is also suffering from these problems.
The problems are:
In the Categories section on trying to access, Comedy, Drama and Sport sections I get "BBC error 5003 Something went wrong ..." message. Retrying just regenerates the message. True Crime and Pod Casts sections are working.
The progress bar and elapsed time on playing a programme doesn't work on the majority of programmes that I've got to play.
Programmes in the 'Unmissable Sounds' section don't play.