I am sorry, I can't help you but did want to warn you. I bought blackout curtains years ago and they didn't have any of the tapes you would normally expect to put curtain hooks in to hang them on the curtain pole. By this point I had ripped the packaging and couldn't return them and was then sleepless and also annoyed!
We use blackout roller blinds with normal curtains over the top. It is not totally dark although it does cut down the light a lot.
I bought blackout linings in John Lewis - they have tiny tabs at the top which you hook onto your curtains (they have the header tape) with standard plastic curtain hooks. I had to buy longer ones than necessary & hem them.
I bought some from Mothercare a few years ago. They came in two lengths and are pretty good. They also have the proper curtain tape at the top of them so you can hang them under normal curtains. The only problems I find are that they hang slightly lower than other curtains (even although they are the same length) and also bulk out at the sides so unless you remember to tuck them in you can see them sometimes.