Maximise radiator output - Central Heating job in Glasgow, Lanarkshire

Job description

I have a vertical ( fairly new ) radiator which takes exceptionally long to heat up. I have tried bleeding the radiator -which seemed ok - but it makes no difference. Can you help ?

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Sean arrived on time & completed the work in an efficient & reassuring way.
An able & pleasant young man with fair prices.
I would certainly recommend him.
Ian Watt