Hello @Graham J
The RKD and the Content team confirm that currently, we do not have any particular currency factor field to convert GBp to GBP.
Hope this helps.
Which RKD API service that you are using?
Additionally, you can find all RKD API resources such as the API document, interactive playground from the RKD API Product page (https://support-portal.rkd.refinitiv.com/SupportSite/TestApi/Catalog).
http://api.rkd.refinitiv.com/api/Quotes/Quotes.svc/REST/Quotes_1/RetrieveItem_3
Which field should I add. I tried CCY_FACTOR which had no effect
I am contacting the RKD API team to check this data/content question.
In the meantime, you can check the RKD API supported fields from the "Coverage" and "Field Lookup" button on the RKD API https://support-portal.rkd.refinitiv.com/SupportSite/TestApi/Op?svc=Quotes_1&op=RetrieveItem_3 page.
Additionally, you can contact the RKD API support team directly via the https://my.refinitiv.com/content/mytr/en/helpandsupport.html page.