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It could definitely be resoled with a good cobbler. I mean, it was maybe up to 1mm further out than I'm used to seeing on Loake/Barker/Church/etc, but it wasn't dangerously so. The original sole felt solid and hardly worn (no soft spots), and the construction as a whole felt quite light. There's a chance you could get away with cementing and pinning along the midsole - that's what I had done with a couple pairs recently.
Losing 1.5mm along the welt seems quite a lot, unless you mean after 3 resoles, or a massive cock-up.
how far in was the stitching on the sole to the outside? It would be difficult to save material when you have to re-sole them, you can lose between 0.5mm-1.5mm on the finishing belt.