I've got an elderly one in white enamel with 2 burners, oven & a grill too. Runs on Calor. It's a great little cooker, but it's fairly heavy. If the price is too high but you really fancy a cooker with an oven, have a look on ebay for an older one. I've seen them sell for around £30 on there.
I bought a Flavel Vanessa off eBay a few years ago. It had two burners on top, a grill underneath and then a good size oven under that. Could cook a whole variety of meals easily - even a full Sunday roast. Cost me £50 and could just hook up to a gas bottle. In the end decided to cut down on the amount of gear we take and sold it again on eBay for £195!! When the guy arrived he gave me £200 and said keep the change - he was well chuffed as it was immaculate and new would have cost £350!
We now take just two Campingaz Bistro suitcase stoves which were in Millets half price sale for £10 each - bit of a difference!
We use an old caravan cooker out of a van that someone was breaking just got it hooked up to a gas bottle on a long hose it works brilliantly fray bentos pies rise evenly in itand its great for doing the sausages in while the bacon is under the grill and the beans,tomatoes and mushrooms are on top.And best of all it was FREE got a caravan fridge too thats 3 way,ice in the sundowners as it has a small freezer compartment.