Spanish applying for chinese visa in the UK

Hi. I am Spanish but living in London. I am visiting Beijing for 4/5 days as the end of the Transmongolian train route. I need a visa, right? I would like to know the price, as I have seen different prices in different websites (from 20 to 151 GBP plus 66 service fee). Also, is it possible to apply for it on behalf of my boyfriend (he doesn't live in London? Thanks!