I think the UK would struggle without the Scottish, Aberdeen is one second most expensive place to live in the UK after London, Scotland is very influenced by the oil industry and Whiskey industry, farming brings in huge wealth too.
I have worked for councils in Wales and Scotland and Scotlands budget was less per person. It always seem they did a lot more with the money, its hard to compare really but it seemed that away, it just seemed that Scotland wasted less and people respected it more. In fairness i lived there for only a few years and only in a small area so its hard to generalise.
As for persecriptions, Wales have had them free for years and years, at least 5, prob more like 7. When we were in Scotland perscriptions still had fees. you had free eye tests in Scotland though.