Cheers for the suggestion.

Funnily enough I went and downloaded IR Scrutiniser shortly after my OP. I'll give it another go and report back.

From memory when I used the analyse option on my working learned code it did seem to suggest the device and OBC were as you say, however the frequency reports as different to the (non working) NEC code I generated with those values.

I may have done something wrong as I'm not exactly an expert on this stuff.