Forum 500
First off, thank you Sarah for posting the cooker here, rather than just dumping it. Rather like the comment made about your washing machine, I doubt you will get a great deal for it, but it would probably be worth putting it on ebay or Freecycle - if someone goes for it it will at least save you a trip to the dump. Be sure that you note its compact size and all the features it has - that will make it more attractive.
What may not be obvious to those not in the know is that this cooker is SMALL, literally 500mm square or a shade under 20 x 20 inch footprint. It came with either four solid plates or ceramic top, I dont recall there being a version of this with a gas top although there was a similar Creda model with did. Its probably around 20-25 years old. There is a lot packed into it for, as well has a 4 burner top, it had a fully thermostatically controlled top oven/grill (broiler) as well as a fan main oven - with self cleaning linings as I recall.
A close friend of mine had one from new and he always liked it and said it performed well, but for a family or someone who did a lot of cooking its size does limit its usefullness. And like most cookers of this type it also sufffers as the main oven is very low, and as I recall it hinged on the bottom which makes a bad situation worse.
Al