hi all agian i now all the crap u can do 2. 10hrs 3. 9hrs but can u do 10hr one day then 10hr straight after and then do ur three 9 s (tacho )cheers ppl 
yes you can is the plain and simple answer
Yea neil46 is right we had a driver at our place who thought if he did a ten hour then he had to do a nine hour the day after think he just wanted an easy run the next day really.
The good book only says what you have said Carlbrum.
Nowhere does it say that you can’t do two ten hour driving days back to back. Nor does it say that you must have eleven hours off between them (another popular misconception)
Given the right circumstances it is indeed possible to do 4 consecutive 10 hour driving days. 