Client ID - BVI partner

I have been approached (email via my website) by a potential client asking if I can prepare accounts for a small UK LLP. The work seems very straightforward.

However, one of the partners of the LLP is a British Virgin Isles company. I have no idea how to go about identifying this client and it's beneficial owners for AML purposes. Can anyone give me any pointers ? I have tried Google but with little success.