apartment therapy changing the world, one room at a time

well, if you can't afford a tub like that ... there's a great hotel in slo that has them in several of their guest rooms. check out the sanitarium spa in san luis obispo. great modern decor too.
http://www.thesanitariumspa.com/

If you wanted to tin a copper tub "yourself"...you would need to take it to a large-capacity metal-plater / galvanizer to have it plated, and then probably polish the whole thing and re-seal it.

Not impossible, but not exactly a weekend DIY either. Also, for persons who want to make low-environmental impact choices, electroplating / galvanizing is a filthy, toxic process that definitely has an adverse impact on local quality of life.

That said, a domestic manufacturer of copper tubs could almost certainly put a custom plate finish on one of their products, for a price.

£3600 = what, $100,000? Damn you, exchange rate. Thanks for researching it, though.