OK, so just for the record, I’ve tried using the NRF24L01 on the Raspberry Pi (via tha GPIO SPI pins) and I don’t recommend it.

So the following is just a record of what I did, in case I ever change my mind :).

NRF24L01 Side  Wire   Raspberry Pi Side
-------------  ----   -----------------
MISO           White   GPIO  9 (SPI_MISO)
SCK            Grey    GPIO 11 (SPI_SCLK)
CE             Orange  GPIO 25
GND            Black   GND     (PIN 20)
IRQ            Brown   GPIO 22
MOSI           Purple  GPIO 10 (SPI_MOSI)
CSN            Yellow  GPIO  8 (SPI_CE0)
VCC            Red     3.3V    (PIN 1)

The Raspberry Pi code consisted of two python files which had to be in the same folder: