Hi Deyah,
We cannot comment on customs matters in this forum, as we can only advise on tax matters.
Please see Guidance at :
Tax and customs for goods sent from abroad: Tax and duty and
Application for transfer of residence relief (ToR1)
Any income arising outside of the UK, in tax years in which you are not UK tax resident, is considered capital and is not taxable in the UK.
There is no time limit for you to bring this capital to the UK.
Any non-UK property that you dispose of before becoming UK tax resident, is not subject to UK capital gains tax and is not taxable. If you dispose of non-UK property after arriving in the UK, then you may have capital gains tax to pay on any disposals.
Thank you.