Bit of a follow up - I have googled it - nothing there. Asked the manufacturer and UK distributor whom I bought it through - awaiting an answer. Correction it's not 1000w it's 550w.
I've bought a Rofco Bread Prover oven (1000 watts) from the manufacturer in Belgium. It was supplied without plug and the 3 wires are green, black and black. The blacks are labeled 1 and 2. Which of these are L and N?