I feel the only way you would be able to make a good sale on this is if someone was using TVShop.co.uk in a major way and wanted to pick up the hyphen too.  In this case a good sale would be above £500.  However, if that's not the case, you only have affiliate types buying wholesale to rely on, and under current market conditions I think any sale over £60 for this hyphen separated domain would be good.  
Rgds