Nearly a third the way across the English Channel

I have been logging all my swims in the pool on the Swimfit website.  It is quite motivational - you can set targets (in distance) such as the English Channel, Around the Isle of Wight, the Thames, Loch Ness and Lake Windermere.

My current target is English Channel and I'm currently 31% of the way across.

Do you the one top tip for improving your swimming technique (and also enjoyment)?  Take swimming lessons, particularly one-to-one lessons.  After just four lessons, I am proficient at breast stroke and my front crawl has come on in leaps and bounds.