Help with swim training

soupy5813

Hi all, I'm beginning training for swimming the length of lake windermere for charity in august next year. Im a competent swimmer and can happily tick off a mile in under an hour in a pool but im struggling to find a good training program that can help me hit 10k in the pool by Christmas this year before i start moving over to the open water when the season starts up.

I'm looking for any advice, pointers and training plans that dont just work on increasing distance or race swim techniques but stroke refinement too from anyone who has hit this kind of distance before. Any help and encouragement will be much appreciated!