Does anybody know of accountants with IPS experience?

Exbourne and Jacobstowe Community Shop in Devon have asked for recommendations on accountancy firms who have experience working with IPSs. They are the only IPS on the books of their present firm which ultimately adds to the annual costs... any recommendations would be very welcome.
Thank you.
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Hi James,
We have used Slade and Cooper here in Manchester, see: www.sladecooper.co.uk.
Wow, a firm of accountants that knows what a cooperative is!
Seriously though, I think that developing some sort register of IPS aware/friendly accountants (and solicitors), perhaps alongside a professional network of such organisations that can develop and support their expertise, would be really valuable if the IPS and cooperative models are to become mainstream.
Having said that I seem to recall a recent conversation where someone had tried to do this a while back, and the professionals had shown very little interest, probably because they can't see the commercial benefit. How can we change that perspective?