Lovely little Massey Harris 726 with a bat reel, she is powered by an Austin Newage straight six which sounds fantastic through that straight pipe with no silencer. I spent many years in the harvest field with a similar model powered by a Nuffield petrol/kerosene engine, later moving on to one with a Perkins L4, all with the same straight pipe exhaust.
Controls:
Top Left = Throttle.
Bottom left = Threshing drive lever.
Middle = Gear lever. Three forward and a reverse.
Right = Traction speed control.
Far right = Unloading Auger.
and up under the steering wheel, the electric cutter bar lift and lower.
Claas Buncher.
Massey Harris Hay Turner.
Fordson e27N with an L4 in a Road Roller.
hope its a dry year for the show, last year my daughter and I got drenched in the traditional post-show Thurdsay evening downpour while lifting a new roof beam into place (at home) reminding me of the numerous times we got drenched while pulling down the NICE Soc. Stand for transport back to Drayton, one wet year a pal and I went with an old matress pre-strapped on the front of our 80's to speed the process of pushing stuck motorists out. 
made mine from a Massey Harris combine bed winch and 5 solenoids, wasn't long before the dynamo went in favour of an alternator......... 
There were a couple of specials there, one with wooden mudguards 
and one with a double chassis, one set of rails on top of the other for extra height to keep the engine and transmission out of the water. (I think). A number of 6 cylinder conversions too!