Just wanted to update this thread as had some great customer service from hpi today. Turns out that the tx and rx on boys model has been discontinued and they don't sell my tx anymore,been keeping an eye on eBay but no luck. So was looking like If I wanted to replace the tx I would have to buy the new esc/rx to go with it as the new radio gear will not bind with my existing old rx, so cost was coming close to the price of the car and would not be worth it. I messaged hpi to ask if they still stocked the old radio, they replied next day to say they don't stock them anymore but went out of his way to help and managed to find an old model that was returned with an esc fault so radio is all working and has offered to send out free of charge! If I can get it working again my boys gonna be well chuffed he's not used it for ages. Just wanted to mention it as I was pretty impressed with customer service like that especially as the car is over 3 years old,thumbs up to HPI. Sent from my iPhone using Tapatalk Pro