I dropped into the apple store in London today, they only have it in black. The apple uk website doesn't list it at all and the only place online that will ship to the UK (bhphotovideo.com) wants to charge £30 for the case, £30 VAT and Duties and £30 shipping. 
https://www.goincase.com/products/detail/hardshell-case-cl57248
https://www.goincase.com/products/detail/hardshell-case-cl57248