Hi Thank you both so much
Yes a bit scant with the info, sorry! - here is the jumper in question unfortunatly the pattern is not available on line:
I'm working the back at the moment. I'm about 20cm into it. I've decreased to make a waist and am now on the increase again.
I just realised I left out a (possibly) vital piece of information
K2, M1, K to last 2 sts, M1, K2 35(39:41:43:47:51)sts
Work 5 rows ending with a WS row
Inc 1 st as before at each end of next row and 2 foll 6th rows.
Work straight until back measures 44cm ending with a WS row.
I still think though that you are both right- that I need to increase every 6 rows twice.
OK fingers crossed...
Thank you so so so much!