A London foundation trust is rallying members to help protect services against centralisation.

Chelsea and Westminster foundation trust has written to its 13,000 members suggesting they challenge London primary care trusts’ plans on the location of hyper-acute stroke units and major trauma centres.

Chelsea and Westminster chief executive Heather Lawrence said she accepted Charing Cross Hospital, the preferred site for hyper-acute stroke in north west London, was a “marginally” better location than her foundation trust.

However, plans say that if nearby St Mary’s Hospital is approved as a major trauma site, hyper-acute stroke would also be sited there. Both Charing Cross and St Mary’s are part of Imperial College Healthcare trust.

Ms Lawrence and Chelsea and Westminster chair Sir Christopher Edwards said in a letter to members: “We are concerned that this may call into question the reasons why Charing Cross was recommended as the best location for a hyper-acute stroke unit and therefore we are drawing this issue to your attention because you may feel it is appropriate to support our bid.”

The consultation ends on 8 May.