CGT on vaulted gold

[AndreaH]

Hello,

I'm having to pay CGT for the first time on sales of vaulted gold that I have in Bullionvault (all in the same vault). Please could you confirm whether I've understood the gains calculation correctly - here's a hypothetical example:

Lifetime gold purchases:
2012-10-01 0.100kg cost £1,000
2013-10-01 0.100kg cost £1,000
2014-10-01 0.150kg cost £1,500
2015-10-01 0.100kg cost £1,000

Total purchases: 0.450kg
Total cost: £4,500
Average cost per kg £4,500 / 0.450 = £10,000

Sale in 2024/2025 tax year:
2024.10.01 0.200kg realised price £3,500

Original cost is 0.200kg * £10,000 (Average cost per kg) = £2,000
Gain is £3,500 (realised price) - £2,000 (original cost) = £1,500.

I'm assuming that any gold sales made in previous years are completely irrelevent to this calculation.

With many thanks.