This time of year is brilliant for propagating a wide range of shrubs from semi-ripe cuttings. To find out all you need to know to do it for yourself, check out our Grower Tips at https://www.greenplantswap.co.uk/grower_tips/semi-ripe-cuttings
Interestingly, old books and sources will tell you that before you start, you have to test the growth first to check that it is semi-ripe. Carefully bend the shoot and if it whips back too quickly or it snaps, then it isn't right. But why bother? Growth in mid-summer is semi-ripe because it's between soft and hard!
So, don't get worked up about when to take your cuttings, don't bother testing it - just get on taking them now, so you'll have lots of new stock to swap and sell.