Four Umbrella Options, want to contribute to Vanguard SIPP, which one?

[FreakShow]

Thanks for the input. It's a question I hadn't considered, so something I'll ask them about.

I received some feedback from Four two on an example pay slip, but they don't support vanguard. I bet I'll have to setup a separate SIPP....

[FreakShow]

I am starting a new role and the four contract options I can choose from are:
- Giant
- Parasol
- Danbro
- ForeTwo

I've not used any of these before, but I'd like to pay my pension money directly into my Vanguard SIPP. Paystream never allowed this and I had to have...