VPS pricing: 123-reg taxes linux users

In my inbox today dropped an email from 123-rg.co.uk, who we buy DNS services from, announcing their new VPS services.  Following the link the services looked very good, 1Gb RAM and unmetered bandwidth from £9.99pm. Things started to go downhill at the OS selection stage – only Centos or Ubuntu were offered as alternatives to Windows and things got even stranger with pricing – a like for like VPS with Linux was 50% more expensive than one with Windows.  Very strange given the zero license costs of the Linux platform, so can only be described as a tax. Great news for Windows...