I am bemused by the DVLA online system. I do not have to pay for a replacement tax disc if I renew at 6 monthly intervals but if I want the convenience of a 12 month disc I have to pay £20. Catch? The DVLA web system does not have a 6 month disc option for this car. Only a 12 month one for which I am expected to pay. The way round it is to use the local Post Office. Out of curiosity, has anyone seen a 6 month option when renewing a tax disc online?