Sadly, TfW will be replacing their 158s in a few years - so whilst in theory it would make sense, given they’re planning on retaining the 170s for the duration of the franchise I don’t think they’ll go for it (unless things change)Not only would that make sense, but the interiors would be easily reconfigurable - both have the Grammer IC3000 seats, though they would require additional tables and luggage racks.