As far as I know, the Condense Data utility is no longer available in QBD UK version. You may have 2 options as workaround:
1. Utilize one of these tools to migrate data as of January 1, 2014 up to now to a new company file. Make sure you setup the beginning balance for each account.
https://transactionpro.grsm.io/qbd
https://partners.saasant.com/affiliate/idevaffiliate.php?id=5051_2
2. Purchase a 3rd party condense service to remove any data prior to 2014.