Sorry once again to everyone following this or finding via Google search… the plot thickens as they say. I now however have 100% values for wan packet overhead and mpu for VDSL2 PPPoE PTM (FTTC) with vlan 101 tag in UK. I was going to just edit my above posts with the final info but hopefully people can look back and see the journey and the reasoning. I guess the point is don’t be afraid to try and experiment till things fall into place!
Absolutely, the journey is just as important as the destination, but glad you have got there in the end, your hard work and time spent on this is much appreciated 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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