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@DaveNI
After a bit more reading I think I now understand - if specified the sck, mosi & miso options MUST always refer to a pin which is marked as being the sck, mosi & miso for that particular SPI.
SPI1 can either use pins B3, B4,B5 or pins A5, A6, A7.
SPI2 & SPI3 only have one set of available pins each.
The purpose of specifying the pins in the tutorial was to ensure A6 was left unused by the SPI1 so that it could be used as a basic GPIO.
I'm getting there gradually I think!!