Golden_Glow90

I have recently bought the Sydney Opera House and have it on display in the lounge. I really want to add LED lights to show it off in the dark as the opera house itself looks amazing lit up. I saw someone on YouTube who had made the street lamps light up around the outside but it doesn't show you how it's done. What sort of LED lights would I need to buy in order for them to fit inside the tiny street lamps and how would I hide the wires? Would you buy battery or mains operated ones? Any help would be greatly appreciated as I've spent ages Googling but can't really find what I want. I'm also from the UK so they have to be supplies I can buy here.