Bit of an update to this. Last week I emailed Rossendale Models who got back to me quite quickly with some advice that I had already tried/didn't work. I replied telling them so and have heard nothing from them since, so they are not much use.
Etronix/CML distribution finally got back to me saying they had tried some ESC combinations and couldn't find a problem like I have and that they don't advertise the system as having a failsafe even though it says "throttle neutral failsafe" on the Etronix website.
Anyway, at their request, I returned one of the RX's on Monday to CML and sent them an email detailing the problems and the testing that I've done so far (I included a written copy in the parcel)
I haven't heard back from CML, not even a confirmation email.
So I doubt that I'll be racing this weekend which is a blow since I work shifts and don't get many weekends off.
I'm still hoping that I might get a new, working RX back in the post tomorrow but I guess it's unlikely.
Don't think I'll be buying Etronix/Core again
