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Thanks.
They look especially good as I could order it to exactly the right spec to cut down on... cutting.
Next question is what type of drill bit would be best to drill big round holes?
hugo7-
If you only want one size and fairly large, i.e. 15 mm plus . A hole saw is probably your best bet, a selection here at screwfix.
http://www.screwfix.com/p/starrett-20mm-holesaw/95906
These also work but I am not really a fan, depends what you need positional and size accuracy wise. https://www.amazon.co.uk/Q-Max-Sheet-Metal-Punch-QMA20M/dp/B0055KJGW8
Preferred for one off holes.
freezing77
It's not far off, the industrial scale suppliers are cheaper but often have high shipping charges which makes the total the same if you're only buying a small amount.
600×300×3mm 1050 is £23.56 shipped from http://www.aluminiumwarehouse.co.uk/sheet_calc.php and 5251 is only a few pence more.