Sandy is an 'H' plate, first registered 15th September 1969.
Chassis: 241*****G - Began April 1969; headlamps moved into wings; cross-shaped grille; number plate to centre of bumper.
Engine: 241*****A - From January 1969, the 4-cylinder petrol engine moved to an 8:1 Compression Ratio, giving a slight boost to bhp.
Gearbox: 254*****E - 'for 2.25-litre petrol models..'; In December 1968 gearboxes began 253*****E, so this tallies with a September 1969 registration date.
Front Axle: 241*****B ((88 RHD '2A' Axle)
Rear Axle: 243*****B (88 RHD 'from December 1966', '2A' axle)
Looking at the numbers then, there's a very good chance she still has the engine and gearbox she came off the line with.