I added the blackcurrants in whole, didn't have a particular recipe that said how many, so I just put some in and gave it a go, I have added sugar now and that didn't improve the taste, I have some more blackcurrants in the freezer, so I might defrost some and put more in, as it is undrinkable at the moment, might just experiment with some sugar syrup and more blackcurrants! I will let you know the results. Thank you for your help.