Debt in GBP/USDCXR carries 2 GBP denominated liabilities. As of March 31, they were a term loan valued at $685m US and the Cinven performance payout of $198m. Considering UK sales are around $400m out of which expenses are paid in GBP, the FOREX issue is really a non-issue for the coming year.
The balance of the debt appears to be USD.