Do you need to be registered with HMRC under the anti-money laundering regulations? All accountants, lawyers and currency exchanges need to be registered either with their trade body or HMRC, but so do the following types of businesses:  
- Casinos
- Estate Agents
- High value dealers
- Trust or company service providers.  
The last category is applied to any business that: ‘provides a registered office, business address, correspondence address or administrative address for a company, partnership, or other legal person or arrangement.’

Who needs to be registered under the MLR
http://www.hmrc.gov.uk/mlr/getstarted/register/who.htm

What are trust or company service providers
http://www.hmrc.gov.uk/mlr/getstarted/register/tcsp.htm