I think you're pretty safe with Marriott double doubles being standard North American double doubles.

The Glasgow Marriott is a high rise slab. It kind of sits off by itself, and you'll need to walk a few blocks for restaurants and other amenities. When we were there, there was no concierge floor or lounge, but that's been a while. Service was fine. The hotel restaurant wasn't cheap, but it was pretty good. There was convenient parking, but I don't remember if there was a charge, or how much it might have been.

We'd really appreciate it if you'd post reviews of the non-London Marriotts you stay in on your trip in the Marriotts in England, Scotland, and Wales topic when you return from your trip.

Have fun!

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The Delta Flyers' Guide