Yeah I wasn't too comfortable with the range that I was given. I think I took it to the wrong bike store, should of tried somewhere that doesn't just deal with certain bike brands. I don't think his digital calliper was the most accurate tool for the job - I was really hoping they'd have one of those seat post measuring rods...

The current seat post that I have on it measured 26.4 and very almost fits..
I think I'll be trying a 26.6mm seat in the next few days..

So stressful..I really want to ride this bike! (without the seat swivelling

I'll let you know how it goes...

Thanks for the help..