Have a look at the Samsung range. I purchased a Samsung ML-4500 about 4 years ago and its been a good workhorse. The toner cartridge can be refilled at home which makes it an interesting money saver. A few other forum members are also owners of similar Samsungs.
The ML-4500 as been superseded a few times, and I believe the latest model is the ML-2010R, which should be readily available in most good computer equipment outlets. Ebuyer have these on offer at £42.99 (QuickCode 14806). Delivery would be on top of this price, but if you add £7.00 by buying other items on top of the £42.99, you will then get free delivery.