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Trident shaft is noticeably thicker on G too.

Reverse G by number of teeth

I cannot easily make any judgements or spot any distinctive differences about the hair to shoulder for the two reverses - I'll leave that to you with two more photos, reverse G first, then I. The sea/rock line is the diagnostic for me. But you're right that reverse I is considerably rarer and quite an underestimated scarcity in my opinion. Happy to help! PS another diagnostic is that both arms of the H of Half point to spaces on Rev G and beads on Rev I...

Definitely reverse G. Easiest way to spot is the sea meeting rock level at the extreme left of the exergue. On Rev. G it rises up slightly and does not cross the linear circle. On Rev. I it is pretty much level and does cross the linear circle. See enlargements below...

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Purchase these coins in Canada for around 62 pounds ($100 CAD). Shillings: 1711 Queen Anne shilling. 1745 King George II shilling. 1787 King George III shilling. Half Crown: 1697 William III half crown.

Probably make about £40 / 50 profit on eBay .. oops sorry I mentioned that awful word on this site ..

Nice coins Lee, lovely pieces of history. cheers

sorry for the wording I purchased these coins for 62 pounds in Canada.

£8000-£10000 is a hell of an estimate