Originally Posted by EuroCarParts

For premium quality, we'll normally stock a Lucas/Bosch reconditioned unit - These are professionally rebuilt and tested to ensure the best value for money possible - you will also (normally) get a surcharge refund for returning your original unit (as this gets sent back for them to recondition and re-sell.

The RTX brand, is a excellent value option, and unlike the above, they are brand new out of the box and don't require the return of your old unit (great if yours is physically damaged and not valid for surcharge return)