We use Halifax for home insurance.
They are far from perfect, but they include a higher limit for 'garden cover' than any other provider I've found, i.e. your patio furniture, BBQs etc. Also seem to remember they were quite reasonable with high value items.
Whoever you go with, do not settle for anything less than 5* rating from Defaqto, anything less than 5* means there is a compromise somewhere in the cover
https://defaqto.com/homepage/
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2019 BMW M5 (my daily driver)
2002 Mark's D2 S8 FE
2020 BMW M340d xDrive (Anely's daily driver)
2000 FL D2 4.2 QS - SOLD 2011