It depends on whether you were previously living in France, or just had a second home there.
If you were previously resident in France, you may be eligible to apply for Transfer Of Residence relief – details are in HMRC guidance here:
https://www.gov.uk/guidance/transfer-of-residence-to-great-britain
Otherwise you will be liable to pay import VAT and duties on the goods you bring into the UK (on the basis that the value would exceed “duty free” limits).