the part alone (8200035273) is about £931 net price and usual price to fit a steering rack with dealerships is around £250 for a full dashboard stripout.
so a quote for £1400 is about right
do you know what has failed on the rack ?
btw that second part no. is £1031
what is the 1st 4 digits of the VIN ? as anyone checking will need the chassis version??? (JM##) ?
If the fault is electronic on the steering column, then unless the fault in the (electronic lock sub-module) is due to a mechanical sub compnent in it, then you will have to get a new column.
If its only mechanical then you may be able to getaway with just changing the mechanism and swapping the electronic module over. (the electronics module is pre-coded to the car and not interchangable)
I'm not familier with this part so have no idea if you could save money swapping sub components of the unit.the electronics module may have different mounting fittings.
if the weather wasnt so horrible out there, i might run round all the local yards and see if i can help find a matching part.