Car tax with no registration document
Hello, I bought a car in January from a man that was emigrating to Australia a few days after I had purchased it. He gave me the new keeper's details slip and said he would send the rest off - I used the slip to purchase road tax for 6 months. I waited about 2 months for my new log book to turn up but it didn't, so I called the DVLA and they said that they had only just received the paperwork from him and they would sort it out. Time has passed quite quickly and my road tax is due at the end of this month, however, I can't find the new log book anywhere, and to be honest, I don't actually recall receiving it through the post. I also haven't been sent a reminder letter from the DVLA saying my road tax is due for renewal at the end of this month. Obviously, I will need to chase them up about it, but in the meantime, will I be able to use the new keeper's details slip again (at a post office) to purchase my road tax, as because I don't have the new log book, I don't even have the reference number that I would need to purchase it on-line? Thank you.