I suppose I should have expected that!
There seems to be a large number of free ODBII reader apps available - I was just hoping someone might be able to recommend one of them that might help me in this scenario... I need it to work with a Bluetooth code reader.
I'll even pay for one if it's worthwhile!!
Torque by Ian Hawkins.
I used the free app but it was so good I bought the pro version. I reckon he deserves a few quid for making such a decent app.