I’d just like to say a huge thankyou to @SteveC, @FlorianBome and those who helped me out with testing on my APC40 patch (ARC). It’s been a heck of a learning curve and Steve, I think I am making progress with bit stuffing too!
If anyone has an APC40 mkII and would like to see what the constant onslaught of irritating questions (and the odd email (apologies Florian / Steve)) has led to, please take a look at https://www.theapc40extender.co.uk/