Rcd 310 aux option disappeared?

[gizm0]

Hi all, installed an Rcd 310 the other week, aux function was working fine but today it has disappeared? Not sure if it's me being stupid or something. Only thing I can think of is I had cruise control fitted yesterday so not sure if something to do with that could  have done something?
Has anyone got ideas on what I can check or try?

Thanks in advance

Dan