I've remembered how much I love swimming. I am going to try to go 2/3 times a week. I'm up to 50*25m lengths. I did it in 38.16 today, but I'm hoping I actually did 54 lengths in that time as I lost count a couple of times 
Anyway, I've some questions, if i may? How do I get faster? I am very much a plodder and no idea how to improve. I'm going to try a coached lane swim next week but is there anything I should work on first?
Lane etiquette: how close should I let the person behind me get before I stop to let them pass? I've been lucky so far with usually only one person in the lane with me, but I was thinking maybe 5-10m? Also lane etiquette, if I stop, which side of the lane should I stop in? I was doing a clockwise lane today got annoyed when my lane "partner" stopped in the top left corner, I would naturally go for the top right in that round. Which of us was right?
Finally, something whimsical, what do you think about when you swim? I find I'm counting a lot and doing mental arithmetic, counting lengths, working out the percentages and fractions, distance so far, etc. And writing AIBUs in my head about the guy stopping in the right spot in the lane. It's nice not to have anything pumped at me for a while.