Thanks Piwoslaw. it's as I thought. We do have the thin radiators. Because the air nearer the ceiling will be the hottest in the room then that's where the greatest Δt will be causing more heat loss than with what I hoped would improve the overall efficiency.
I did think it would be better to have the airflow increased across the whole of the radiator.
I have been wondering how I could do it without using a lot of power to produce it. I guess there has to be a sweet spot but exactly what that would be is probably something I would have to do empirically. I might get a few smaller PC fans and arrange them in a row along the bottom rather than a bigger fan with ducting. I can get 4 of the 60mm fans from Amazon at GBP9 and they are 5V 0.1amp each with air flow of 13.8CFM
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