I need some help with a film I shot at the wrong ISO. The film in question is Ilford HP5 and the ISO is 400. Trouble was that I had already shot off a colour reel at 200 and I thought I changed it (sorry I didn't mention that I am using a Nikon FM2) but half way through the shoot I noticed it was still on 200. Normally, I would say c'est la vie and put it down to experience but I know that there are some decent pics on this reel and I know I can rescue the film. I will be using Ilfotec LC29 developer but I am not sure how I can pull the film back. Any offers of help would be much appreciated and hopefully will lead me to post some pics that I have developed. By the way I am new to this game and I have just started my last course in a City and Guilds program and I really want to do really well. I love this site and all the ideas and help other users give each other.