Andy - I really appreciate your support and advice. I did search for digital sets but gave up after the first few all said Pre Order. Anyway I've pre ordered one from Scalextric. With regards power - I understand that the Arc Pro will need 2 power packs (my circuit will be about 30 metres long) but I am a bit confused about 'jumpers'. What are these jumping from? Do I need a 3rd power source? Please advise. And again, many thanks