Once I got them home I attempted to change the pedals - but Voldemort had put them on too tight - and despite my very best sweaty red-faced huffing and puffing...I just couldn't shift them. So this afternoon I took the bike to the bike shop to get them changed over.
The man changed them for me and then pointed out that I had been riding the bike for three days with the handlebars turned completely through 360 degrees. Somehow - whilst in storage - the handlebars had been turned through a full 360 degree turn. This meant that the gearing cables and the brake cables were incredibly tight around the handlebar stem...but ....because I am a tit I just never even noticed.
The staff in the bike shop were smirking. Twats. We all have to learn somehow...don't we?