I didn't realise I'd have to start a new thread - it's amazing the amount of people that have offered advice / made me laugh, it's appreciated
It was the strangest thing! Yes Yeo Valley yoghurts and milk 
I've not been able to change the locks but I've double locked the door this afternoon, as he doesn't have a key for the bottom lock
I do however, have his bike at mine (which won't fit in my car, only his)