Thanks for your repsonses - apologies for my late "thank you" - since I last wrote I've managed to have a bike crash and then pneumonia which I picked up after my last open water swim race! I did my quickest time and then promptly fell very ill. I didn't realise I was so sick and did a bit of damage to my lungs. So frustrating! Feel like I'm starting over again....
One last question if you can bear it: when doing the lengths in the pool do you tumble turn or hand touch? We only have a 20m pool at hand and I think tumbles make the length even shorter?!