This icing is fabulous! And I would like to say a big thank you to everyone who has contributed to this thread (and others), there's no way I'd have been able to make these without your help (I tried).
My contribution to the knowledge of cupcake icing... is to start making the flour/milk roux before making the cupcakes. Hopefully the cupcakes and the roux will have cooled by about the same time (which is great for impatient people like me).
I made strawberry flavoured...I added 1.5 capfuls (Queen brand) of flavouring and a teaspoon or two of 'rose pink' colouring (also Queen brand) and continued to wizz it for another minute to make sure the colour went right through. Then sprinkled a little bit of fairy dust over the top.
I used a Wilton 1M tip and circled from the outside in.