So I rang Samsung uk as soon as they opened at 9am. First I was told I should get a free vr, until she backtracked and told me to call promotions support. He said I should get a free one but best to ring the shop. Neither could confirm anything about the silver option.
The shop didn't know anything about a silver option either but she told me that currently the free vr is not available through Samsung direct but is available through Vodafone and carphone warehouse. Apparently due to Samsung seeing it as potentially a huge and popular promotional offer it might not uphold its promises.
Oh. My. God.
I recorded all 3 calls. I might post them to YouTube.