Never seen anything like this for the 1.6 engine myself. Politechnic do a nice 2.2 cover
I'm not sure this is available any longer Graham. It wasn't when I last checked, which is why I'm looking into plating a 2.2 cover.
... which is of no use to you though. How about jazzing up your original cover with a crinkle finish paint in red or black?
Frosts do a D.I.Y. aerosol paint but as you obviously want a fine and dandy finish how about this:-
http://www.powdercoated-customcarparts.co.uk/crinkle-heat-resistant-paint/Contd.......
Just had a look at the Maurelec one you are thinking of. It has no crankcase breather as far as I can see, so you would have to do some engineering here also unless you have an oil filler cap with the built in breather?. (300Euro...ouch!)
The Maurelec ones (both 1.6 and 2.2) are definitely no longer available as I have contacted them about their covers.
I have also tried the person in Ireland who claims to make custom alloy covers but he has never answered me.
The only way you are likely to get an alloy rocker cover for the 1100/1294/1442/1592cc family of engines James is if you can source a second hand one, I'm afraid.
Roy