ROG:
Now to expand that to the regs using basic ENGLISH…
Within each (period) of _(24 hours)_does not say that it is a (24-hour period) - the words etc would need to be in the same bracket to make it the same.
Ok, Neil gets extra points when he gets you to type bold or in different colours. I count my points on the time in the mornings i get a reply 
But really, we are all doing a lot of guessing, assuming and trying to work out interpretations. All totally unecessary, as its been done for us.
Two questions is all we need to answer.
We can start with the basic question is it legal to use 7 charts in six days, if we can assume that each chart is seperated by legal break and the 7 charts do not go over 144 hours.(the original question)
Can we work past a 144 hour limit, counting from when we last finished our weekly rest.(My question brought about by the 144 hour limit assumption)
And here is the rule, from regulation (EC) No 561/2006, Article 8
A weekly rest period shall start no later than at the end of six 24-hour periods from the end of the previous weekly rest period.
All we need to answer is what is six 24 hour periods?
If anyone does not want to read throughTHIS. then i’ll take the libery of highlighting the relevant parts.
First thing to note is that this judgement and the one cited within it are actual definitions to regs 561/2006 and 3821/85, and indeed are quoted as being the relevant descriptions.
So what is a 24 hour period?
29 In its judgment in Van Swieten, cited *****, the Court defined the expression “period of 24 hours” as meaning the period commencing at the time when the driver activates the tachograph following a weekly or daily rest period.
30 The reply to the second question should therefore be that the term “day”, within the meaning of Regulations Nos 3820/85 and 3821/85, must be understood as equivalent to the term “period of 24 hours”, which refers to any period of that duration which commences at the time when the driver activates the tachograph following a weekly or daily rest period.
From this we can deduce that a period of 24 hours starts when we end a rest period, weekly or daily and we activate our tachograph. It finishes when the 24 hours are up. When does the next one start? Again we can refer to the above definition, it starts when we finish a daily or weekly rest period and we activate our tachograph. This being the case, it is possible that the second time we ‘activate the tacho graph’ may be 30 hours after the first activation (of the week) or it may be shorter than 24 hours. Thus six 24 hour periods could be less than, equal to or greater than 144 hours.
Thats all we need to know to answer the original two questions. Therefore you cannot ‘use 7 charts in 6 days’ as each chart constitutes a 24 hour period. And yes you can work past 144 hours since your last weekly rest as six 24 hour periods does not neccesarily amount to 144 hours.
As an aside to these questions, in a fixed week if we max out our working hours and minimise our breaks trying to work to the 144 hour limit and then taking a reduced rest of 24hours, if we do it per VOSA style diagrams whereby we do the max work and min rest periods, you would be commencing a weekly rest after 131 hours. This would leave you a few hours short of a week, and actually encroach into this 144 hour barrier. This would lead to a fixed week being less than a fixed week.
If we try the same diagrams concerning maximum daily work and minimum rest then we do indeed come to a full 24 hours.
Thats your definitive answer irregardless of any other advice to the contrary. Thats not my answer, thats exactly what the regs say.