Health expert Marcus Longley warned that changes to the NHS in Wales, with fewer major A&E departments, could make the pressure on ambulances transferring patients worse, as response distances and times are increased.
Professor Longley said, though, that current problems lie within the system more broadly, and "the health service needs to get ahead of the problem, rather than just forever scrambling to catch up with it."
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Hundreds of people took part in a protest march in Haverfordwest today over changes to hospital services.
A fairly cloudy day to come with a few scattered showers.
Ed Miliband paid his first visit to Wales as part of his General Election campaign, with a message that Labour would help working families.