USD Bond managed by UK GBP broker. Is Capital Gains calculated on USD amounts or GBP amounts?

Example figures: (the amounts do not matter - my question is whether the gain or loss is calculated on the USD values, or the GBP values). Eg: 110,00 units of USD Bond: Bought in Feb 2014 at 100.925. Cost = $111,017 = £67,653.58 (XR = 1.64097 USD/GBP) Mature in Oct 2023 at 100.000. Value= $110,000 = £88,524.14 (XR = 1.24260 USD/GBP) Is Capital Gains chargeable amount... .. calculated on USD $ amount (ie. $1,017 LOSS?) or calculated on GBP £ amount (ie £16,439.40 GAIN?) The broker automatically transferred USD amounts received, in to GBP. If this is covered in the guidance, can you please point me towards the exact location in the guidance. (I couldn't find it) If this is not covered in the guidance, please advise me, or help me find someone who can guide me. Many thanks for any help or guidance.

Hi,
As all foreign income must be converted to sterling to report to HMRC it will be on the GBP values.
Thank you.

Hi HMRC Admin 20 Response. Thank you for clarifying, that it should be calculated on the GBP values. This service, and your response, are much appreciated. Best regards.