This was from a good indie, RCV in Tonbridge Kent and thinking further cost may have been nearer £400. You can DIY it but is quite a big job. I did one years back on a Sierra but would not tackle today as just dont have the time (or the will).
Costs if converted would come to about 500 to 600 pounds.... Actual matrix cost then was about 300 pounds if I recall. But labour charges in South Africa are probably a lot cheaper than yours... so not a good comparison.