I am certainly willing to accept it might not be the filter as they are dry foam as you say. Once I have a replacement I will try and clean the faulty one and see if I can get it working again.

Noticed today that at full boost the boost was wobbling all over the place ~+- 2psi ish. I assume the new MAF will sort that out
 
PiperX Viper kit killed the MAF on my Ibiza Cupra... killed it within to 3days of being on there. Visible signs of the "protective oil" they use on the foam insert.