I agree with Steve - if you don't want them sold through the mart, either eat them yourselves / feed to your dogs, or see if the abbatoir would take them directly. Or you could ask your local hunt if they'd like them.
Please don't sell the meat as mutton; old ewe is what gives mutton a bad name! The word originally referred to the meat of 20-month old wethers, which in a lot of breeds is when they are at their finest eating.

You can make use of the old ewe meat in your own kitchen, or sell it / swap it with friends as what it is, old ewe. It's very tasty but does need long slow cooking and will give off copious amounts of bright orange fat! There's nothing like it for lasagne, or a hotpot or similar. And you can even do joints if you do a long slow pot-roast. Just build into your menu planning time for the dish to cool, be skimmed, and then reheated - unless you don't mind pools of bright orange fat separating off on your plate while you are eating!
