The OKI B430 range of mono laser printers have now been discontinued and are no longer available for purchase.
For a suitable replacement please look at the B431 range:
https://www.printerbase.co.uk/acatalog/oki-b431-printer.php
The main improvement with this new machine is an extra 10ppm print speed.
If you need any further information please call 0845 230 7234.