Juicy (?!) - in my experience, it does take a lot longer than a week for the blister to heal so I've carried on training but with Compeed plasters on the blisters. Compeeds form a sort of second skin so the area doesn't harden. They recommend you wear them until the area is completely healed so when one came off I just put another on straight away. I've also found that if I grit my teeth and keep on running without protecting the sore area I just get even deeper blisters on the current blisters - not nice!
Hi again! Thanks so much for all your advice. Still getting blisters on my blisters! So - about to buy a pair of NB 752's - anyone any comments. I too used to run in Asics 2080s - major blisters apparently caused because I'm a neutral runner and these were too supportive.
Thanks to all of you who took the trouble to reply to my 'blisters on insteps' crisis. Am training for Great North Run and this problem is definitely spoiling my fun! Will certainly try your suggestions.