I've never ordered from this company but somehow I'm on their mailing list. They have furniture in all styles (including retro) at amazing prices.
Home Decorations - Furniture - Bookshelves | HomeDecorators.com I don't know about shipping to the UK though.
eta- BTW I love your theme! Please post pictures when it's finished. It sounds like it will be so cute!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226