I have a "scangaugeII" fitted to the obii port in my Toyota 4Runner. It's permanently installed in my centre console and it provides numerous readings ie. ignition timing, mpg, volts etc. etc. Has an LED display also powered through the obii port.
It can also read the fault codes and clear check engine lights.
The good news for you is that only obii ports(1996 and on) can facilitate such a device/reader.
I bought mine in the States but I'm sure something similar will exist in the UK too. obii is a standard connection/plug which is used by motor manufacturers across the globe.
Try googling obii
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