Just watching Antiques Roadshow and someone brought in an excellent cast portrait of the great Joseph Whitworth, removed from a building at Crewe. It's just a shame that the 'expert' didn't seem to have a clue who Whitworth was or his significance as one of the fathers of modern engineering.
Estimated £500-£800, I would have guessed that it should have another nought on the end. I find it a great shame that something comissioned and made with such obvious pride should be left to rot by the rail industry then end up getting swapped for a 5 quid wooden desk (how the owner came to have it). This should be restored and hanging proud for the world to see in the Science Museum, or the National Rail Museum.
BBC Iplayer if you missed it - Antiques Roadshow Series 38: 24. Trentham Gardens 1