Each child is different. I say why not give it a go? The best advice I can give you is to not put any pressure on yourself or him. It will only end in disaster. My DD1 was TT day and night at 22 months and DD2 TT day and night at 19 months so it's definitely do-able but it really does depend on your child and how they adapt to the whole idea. Give it a go. If it works, great! If it doesn't, then just wait until you are back from the UK. Five weeks won't make or break toilet training good luck xx