Bank of England, K.O. Peppiatt, emergency £1 notes, S16D, S06E and S07H, these are all the known replacment prefixes for type, also another replacement £1, S35S, signed by P.S. Beale,, (B250, B269), the emergency £1's fine and the Beale £1 choice almost uncirculated (4).
Estimate: £60 - £100