One thing that I did learn from this exercise...before you slip off and buy a replacement switch assy, take the old/buggered one out of the car and either photograph it or take it with you to the supplier...some of the replacement ones seem to share the same part number, but won't fit or are so tricky to fit, you will probably break the damned thing when locking it in!!
Some of them come with two blade pins, others have four connecting pins (like mine).
With the correct switch, the job will take about 10 minutes, start to finish. Cost me a tad over 3 pounds for the switch.
Hope this helps someone.