Not sure if this is the cause, but non current liabilities are very sensitive to changes in discount rates used to calculate the present value of future expendi

Not sure if this is the cause, but non current liabilities are very sensitive to changes in discount rates used to calculate the present value of future expenditure. The Nuclear Decommissioning provision, for example includes costs projected until 2137. In the last accounts it went up 76bn just from changing the discount rate.