Blackcurrant cordial

I like cordial, but not really the bought kind. And I like making stuff, but really I have enough jam already. So I decided to make some blackcurrant cordial. Last year I made elderberry cordial, and it worked fine - I'm still drinking it! So I decided to wing it with the blackcurrants and did this:
Brought my blackcurrants to the boil with a dash of water, then simmered for a few minutes until they all burst. Then I pushed this through a sieve (you could drain them in a muslin), and measured this in a jug. I then added as much water again, and half as much sugar, brought this to the boil for a few minutes, then put into sterile bottles and kept this in the fridge. I'm sure it wouldn't last for ever, but it lasted at least 5 weeks until I had drunk it all! I'd definately do this again with other fruits - raspberries, elderberries, maybe blueberries too.