Just remember that what ever you purchase above your UK allowance has to be declared and the VAT etc paid on the item(s). Yes the watches etc are Tax and Duty free but that doesn’t include what you have to pay on bringing it home. For instance I bought a $9000 watch recently and the UK fee was £1615 😳 Of course you can try and not declare it. But beware the items can be seized and you’ll still have to pay the fine, VAT and the custom fee. Also, with regard to insurance any loss adjuster would check the provenance of the watch and if it’s held ‘illegally’ the insurance company won’t pay 😬
Buyer beware 👍