Unfortunately I couldn't make your lemon butter, Chookie, as the only custard powder I could find had "milk solids" in it. I ended up making the CWA lemon butter off Bush Gourmand's blog. It is really nice and very easy - unfortunately, as I was transferring the rack of bottles from the kitchen bench to the table to cool all but two of the jars crashed to the floor and I am left with only two bottles .... but a very clean floor!!!
I also made Quirky Jo's lemon butter. I was a bit dubious about this - the caramel colour on her blog didn't look anything like lemon butter to me, but I trust QJ's recipes and I was determined to make a lactose free version so went on and made a batch of this regardless of my reservations - and it is, simply, gorgeous
It has so much depth of taste that it was very hard to stop 'tasting' it and put it in the fridge for the night! We'll see if I can resist it today.
I must now go out and buy more butter and make more of the CWA recipe as I promised all my friends who gave me their lemons jars of goodies in return!