Most International MSP arrangements leave your global teams behind
If you run IT for a UK-headquartered business with offices in the US, Singapore, Amsterdam, or anywhere else with a different time zone, you will recognise at least one of these situations.
Your Edinburgh team raises a ticket at 9 am. Your New York office raised the same issue at 2 am, and it still has not been picked up. Your Singapore team do not bother raising tickets any more.
These are not edge cases. They are the natural result of buying UK IT support for a business that has grown internationally. Your current MSP was probably excellent when you were in one office in one country.
The alternatives most businesses land on are not much better: outsourced third-party partners in each region (inconsistent quality, multiple contracts, no single accountability), or putting UK engineers on call through the night (expensive, unsustainable, and hard on your people).