Local estate agents would be able to tell you if it's worth it or not. Assuming there's probate to be dealt with, ask a few of them when they come round and value the place. Or just ask them anyway, I guess.
Going off my proprietary index of how many "we are valuing properties in your area" flyers I get through the door, I think a lot of agents would be glad for something to do right now.
Morden, southern end of the northern line. So debatable if above Middlesbrough