Give the guy a break!
I always renew my tax online, which means I would also have been caught the same way Anton was.
I'm pretty sure that if you renew online you can only do so up to 2 weeks in advance (unless this has changed very recently, last time I tried to renew 3 weeks before it refused). This may be to do with keeping the Internet facing database of vehicles down to a manageable number and from a security perspective it's probably not a good idea to have the UK's entire vehicle database exposed to the Internet 24/7, 365 days a year. I know you can renew earlier by going to the Post Office, but if you're planning to renew online I think the two week rule still applies.
So let's take Anton's case….
I guess he was going to renew online (he doesn't explicitly state this, however as he mentions not being able to renew before the 15th I can only surmise he was told this by the renewal website, where else would he have got this date?). He was out of the country from the 5th of April until the 19th. This means it was not possible to renew online before he left the UK. However, he would be back in plenty of time to deal with this, so no problem… or so he thought… Then Iceland exploded… Was he really expected to foresee this?
Now this is his problem. He can't renew the tax on his vehicle while he is not in the UK because he needs the ridiculously long number that is on his renewal form, something that he would not have to hand. It is likely that he only knows his registration number and as the DVLA offer no way to renew your tax with only the reg number, he's out of luck.
OK, the tone of his post was a little hysterical, but give the guy a break. Let's face it, we've all felt like that after dealing with one Government agency or another. How hard can it be for the DVLA? They have the car registration number, the registered address, his personal details and his DOB. If all that matches up with their records then why can't they tax his vehicle? He's trying to GIVE THEM MONEY and fulfil his legal requirement, he's not asking them to send him cash. It really shouldn't be that hard.
If you are caught driving without tax (which is likely these days with all the NPR cameras around) the police can, and do impound your car and issue points on your license. So when he arrives back at Gatwick, how does he get home? He's tried every avenue to remain within the law and has tried everything possible to give the DVLA his cash.
OK, the volcanic ash situation was unusual, which is why he shouldn't be expected to predict and plan for that eventuality, but it really does show how rigid and unbending the DLVA are.