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Another +1 for Nationwide for this purpose. I just used them to cover buildings insurance only on a new home we hadn't yet moved into from exchange. Easy to call and cancel. They did accidentally charge me for the first month, but we're quick to resolve once I pointed that out. Other advantage is that unlike many other insurers they don't charge you extra for paying monthly versus annually.
I need to renew my home insurance but I'll probably be moving in the 1st-2nd quarter of next year. Does anyone know a provider with favourable cancellation policies, or someone that'll do month-to-month cover?