I used to subscribe to The New Writer. I bought it on and off for many years and only quite recently stopped subscribing, due to lack of time to read the magazine.
It's currently being relaunched, and I find myself itching to re-subscribe again. On the website here you can read 12 sample pages of the next issue, and they do look enticing. There are also some special offers if you subscribe or order the first issue ahead of relaunch - details on home page link above. You can even pay by Paypal.
Oh, to heck with it. I'll re-subscribe. Why not? It's a lovely looking magazine and if you fancy reading a different writing magazine than the ones available in WHSmith, I'd recommend this one. It's a UK mag but accepts overseas subscriptions too.