I have read that the English pound was worth about 12 Scots pounds--still considerably lower. As today, though, whatever the exchange rate, I suppose the comparison would only have concerned people doing business outside Scotland, or an upper-class person with ties to England. For an ordinary Scot, a Scots pound would have been worth a pound. Eight pounds was a lot of money in a time when that was several months' wages for a male servant. These folks were apparently not your average farm labourers if they could lay down that kind of cash.
I am very curious about this eight pounds. It seems a lot for a marriage fee or a church fine, or even a bond. Is it possible that William was new to the parish and that he had to give a bond to show that he was not going to flee before the wedding--possibly leaving a woman and child to be supported by the parish?
Are there other instances of this kind of "consignment" on this page that might give a clue to its purpose? I have seen a number of Scots marriage registers, including fines for "irregular" marriages, but I haven't seen any amounts this big.
Gene-ee-us