ok, i've just tasted my sparkling ale and it is bloody awesome.
it isn't exactly the same as cooper's sparkling ale, but it's similar - it's just stronger in every regard. the malt flavour is stronger, the head retains better, the alcohol is higher (6.9%) and i've got 23L of it

the only thing weaker about it was the hopping (my bad).
i followed the instructions almost exactly to cooper's specifications and you know what? i came out with an awesome beer
the only modifications i made to the cooper's recipe were:
- liquid yeast starter from 1 longneck of cooper's sparkling ale to assist the dried yeast.
- 10g of pride of ringwood hop pellets added to the hot wort and left to sit for about 1 minute in the fermenter before i filled it up with cold water.
great aroma and body in this beer.
i will make this beer again, but next time i will make a 2 longneck sparkling ale yeast starter to assist the dried yeast and i will use 20g of pride of ringwood hop pellets instead of only 10g.
fantastic result. congratulations, dr. cooper

-wombat