So sell then if you are worried!
One has to be able to look further than the end of one's nose when investing!
They are the leaders in a massively growing market so its hard to quantify a price at any given time,suffice to say the shares were at £13 a couple of years back and hit 9p. So somewhere between the two extremes must be fair value.
Re directors buying,david Martell already owns over 6,000,000 so has quite alot of interest in the business succeeding.
His fortune once stood at £78,000,0000 and has fallen to under £5,000,000.
The fundementals are what counts ,being earnings,earnings,earnings. :-)