SpikeUK2564:
Is this set of 8 relays OK (as in not counterfit)?
This is the Arduino relay board... http://store.arduino.cc/ww/index.php?main_page=product_info&cPath=16_20&products_id=113
The phrase "for Arduino Uno" is a good indication the vendor is playing by the (very simple) rules.
A Leonardo would need an additional 5v power supply to to run the 8 relays, right?
Can't help with that one.