Yesterday when collecting my car from the garage after it had passed it MOT the customer service adviser mentioned that with my new style Computerised MOT certificate I would now be able to apply for my tax-disc on-line.
In turns out that to apply for a tax disc on-line you have to meet the qualifications set out here and then you go to this new e-government website and fill in you details.
I can’t wait to try this out when I have to renew my tax disc next year. Much easier than a trip to the post office to join a queue 
iv recently taxed on line for the seconed time the disc ran out at end of jan and i still have not receved it and i have been stoped twice in a couple of days and had my car impounded at a cost of 105 pounds its not all its cracked up to be