Slight misunderstanding as others have said. You can buy a key and remote but it will not start the car, only unlock it.
It appears you have a blade and remote that has now been paired to the body controller. As other have said you need the immobiliser portion sorting. Is what stops a theif doing this is difficulty - you must physically remove and connect to the immobiliser unit (ews) and prepare a virgin transponder. This will then allow the car to start. The transponder looks like an odd shaped piece of plastic nxp pcf7936aa?? as I recall but may be wrong check before buying.
There was a good guide from the states showing how to use an ak90 programmer to do this BEWARE this doesn't work for a 75 as the software isn't aware that rover even existed and used the BMW system. Similar tools exist that do ews editor but for the outlay - post the ews module to a trader.
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