Thank you Guy - I was just looking at the Hilltrek offerings - thanks to Chris T's input.
Hilltrek are a premier Paramo dealer, and also make the Ventile garments as well. At around £190 there a few items to choose from. Decisions, decisions.
On the Paramo front:
In terms of conservation minded clothing, (even allowing for the trip across the south Atlantic,) I do think that a Paramo waterproof is going to take some beating. It seems a good technical garment and the ethics of the company appear ,on the face of it, to be as about as good as it could get. - I can see they have just launched a lightweight jacket called the Quito. - well 500g - which I could certainly live with.
On the Ventile front:
I could have a hand made garment, made to measure - albeit a little different looking to what might be considered 'latest vogue'. As you say still lots of miles of material movements though. but still very tempting, but perhaps heavy as you say.
Either option seems better than the usual choices I might have made. Thanks for the lead on the boots, and I am still wondering where the most ethical/ conservation minded base layers and mid layers might be found.