Hi Richard, using an Alinco 30A max with 25A continuous here, purchased this nearly 2 years ago and have had no problems as of yet. This is really quiet, Maplins do their own version nearly £50 cheaper which our club as purchased and as of yet no problems.
http://www.radioworld.co.uk/dm-330mw_uk_30_amp_switch_mode_supply?query=power%20supply&page=2
The Maplin one is:
https://www.maplin.co.uk/p/moonraker-375w-switched-mode-dc-variable-voltage-compact-bench-power-supply-n87jn
Hope this helps
Paul