In many cases these arrangements work perfectly, though in this case I would do a little more investigation, R and A group have only been going since the feed in tariff boom, where will they be when it falls away ?
On google they state they where established in 05 although companies house state 2008

one of their companies has been going since 05 but not the group nor the renews
You could always look for a company that have been around for a while, also a limited company that is a "group" should list their group holding I am unable to find this, I have checked companies house, no association there, their co's are r&a renewables, r&a electrical services, & r&a systems (Scotland), I would be looking into the small print to who owns the turbine as I'm pretty sure it won't be them.
I personally wouldn't touch this company, I would look for an established, reputable company.
THIS IS JUST MY PERSONAL OPINION