I don't think this is the case, the notes to the borrowing section appears below and seems to indicate that the mortgage is just decreasing by the amount that you would expect from paying off about three million every year. More concerning is the increase in the "Vibrac" loans from roughly 13m to 21m at an interest rate of 8.8%. I would guess that is why annual interest has increased by about 1m
"Other loans include £22,127,000 of loan notes (2013: £23,095,000) which are repayable in annual instalments over a 25 year period at a fixed interest rate of 7.79%. The first payment under the agreement was made on 30th September 2002 amounting to £1,588,000 with subsequent annual payments of £2,767,000 (including interest) starting on 30th September 2003.
The notes will be repaid in a securitisation agreement serviced by future season ticket sales. The costs incurred in raising the finance, amounting to £710,000, have been offset against the original £30,000,000 loan, and are contained within prepaid finance costs and charged to the profit and loss in line with the interest charge over a period of 25 years.
Other loans also include £20,924,000 (2013: £12,868,000) secured by legal charges over the Company’s guaranteed Premier League broadcast revenues. This loan incurs interest at a rate of 8.8% and was repaid in August 2014. The Group has obtained further funding post year end as described in note 1. "