I've bought one or two of the Sew Hip magazines and found them very basic. I have teenagers who were attracted to some of the patterns but I found the items a bit "unfinshed" looking (or do i mean niave?) Anyway, my daughter says I'm not hip! I got them in WH Smith, too.
There is a new sewing magazine to be launched at the end of the month by the Crafts Beautiful magazine house, called Sew. There is a special direct debit rate of £3 for 3 issues for UK subscribers, so may be worth a try as cheaper than a single copy.
http://www.sewmag.co.uk
Sewing World is the UK's best magazine aimed at dressmakers, with other projects too. I think so anyway as I buy quite a few copies, although not every one. I've learnt quite a bit from it.
I subscribe to Popular Patchwork and buy most issues of British Patchwork and Quilting as well. Each has its own style, just like the various American magazines, which can be very hard to track down. Australian ones are hard to source too if you don't want to subscribe.