Try NFU. Our smallholders insurance (House, workshops, barns, 25 acres) went up by less than £60 to £1589 this year. They are also flipping brilliant when it comes to claims, which is a great deal more than can be said for many of the companies.
Tim H. 1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE