Hmmmmmm
Well roofer has confirmed that the IKO layer beneath the felt is indeed seamless and is the waterproof layer.
He's now saying that flashing ( presumably lead ) wasn't included in the price. We did discuss flashing on-site - so I assumed was and more importantly was required.
This IKO seamless stuff - even up uneven stone work requires no flashing?????
Meeting on-site tomorrow to do the 'test' for the warranty.