63 Messerschmitt Kabinenroller 'Tg1400' Special, "'Bubble and Squeak'" built in the late 1960s/early 1970s by the boys of Roxeth Manor Secondary School in northwest London, sold for £10,350 in 2014 (thank you Kim!)

built in the late 1960s/early 1970s by the boys of Roxeth Manor Secondary School in Eastcote Lane, South Harrow, Middlesex. 

It took several years to complete, taking over 2,000 hours in the process. Once seen as a possible competition car suitable for sprints and hill climbs, the Messerschmitt - known to its creators as 'Bubble and Squeak' - incorporates two Mini front sub-frames, one at either end. The rear wheels are locked in the straight-ahead position, though with some built-in flex and hence a measure of rear-wheel steering when pressing on. 

The engine started life in a Minivan and was purchased for £5, a 1,400c BMC A-Series unit equipped with two Weber 45DCOE carbs.

 An article about the Messerschmitt/Mini hybrid was published in 24th March 1973 The Motor magazine

The car was restored in 1994.

https://cars.bonhams.com/auction/21749/lot/196/property-of-a-deceaseds-estatec1963-messerschmitt-kabinenroller-tg1400-special-engine-no-roberts822/

https://www.theminiforum.co.uk/forums/topic/283900-1963-messerschmitt-mini-hybrid/