I have to admit that there are Dunkin Doughnuts in Canada and U. S. A recent business item is that they are expanding sales in California.
For the UK, there is a store locator on the net.

These chains can no more make a good cup of coffee than a good cup of tea. I an sorry that I mentioned Dunkin Doughnuts in polite company.

Some Starbucks have good coffee but many are slapdash; proper care not taken by manager or barista. They do sell good beans.