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That's what I meant by finger in air/zoopla option. I'm on London's famous Harringay Ladder so there's no end of similar-ish properties.
Thinking more about this, the accuracy will only affect the quote so isn't terribly important in the grand scheme of things? The actual cost will be determined by more formal valuations in due course.
Brun-
You can download the Land Registry data from here https://www.gov.uk/government/statistical-data-sets/price-paid-data-downloads to make it reasonably quick to search through the surrounding area. When I remortgaged last year and needed a value I just looked at two or three streets either side and that gave enough options to take a guess at the value.
If you do buy the freehold then it does give you options for extensions, loft conversions, etc if that is a consideration. Obviously partly depends on your lease.
aggi
Check land registry for similar properties in your area. It will have the price they sold for.