Thanks. So for now it will be predominantly East Anglia, in all weathers. Things that are a good all rounder I suppose? I understand that different climates will require distinctly different gear. In time I would expect to have swappable components to deal with those use cases.
I'd suggest that you just use your 'normal' T-Shirts, jumpers, Fleece, cargo trousers and concentrate on getting top quality :
1) Boots
2) Waterproof/ windproof / warm - Coat / Jacket / Shell (call it whatever)
3) Waterproof / windproof trousers.
I do tend to 'walk-warm' and in dry weather will wear a short sleeved T-Shirt and a thin pair of cargo-pants down to about 5*C.
Below 5*C I'll add a thin long sleeved jumper and a thin Merino wool balaclava to keep my ears warm.
Below 0*C I add a 'leather jerkin with a mesh back - the leather front keeps the cold wind off my chest but the mesh lets a bit of ventilation in at the back to help reduce the sweat. Wear a pair of thin Merino wool glove liners (without the gloves)
Wet weather is more of a problem as I sweat so much whatever the makers claim about breathability I'd not be much wetter without a 'top-layer'.
Getting wet makes you cold, so the trick is to try and keep as dry as possible.
Start walking wearing what you've got, find out if you are a 'hot-hiker' or a 'cold-hiker' and develop your own kit-list.
Remember - Everyone is different.