There is history between Ryanair and Manchester Airportsgroup and as a rule Ryanair have lost.
Way back when (about 20 years ago I think) ... Ryanair werearguing with Manchester Airport about the fees they had to pay and unilaterallydecided to refuse to pay some of them. The result was MAG went to court and gotpermission to impound a Ryanair aircraft which they did. Ryanair paid up andthe aircraft was released after one Dublin rotation was cancelled.... How weall laughed.
A little more recently Manchester Airport Group refused to givein to Ryanairs demands for lower fees I seem to recall the phrase “we were madean offer that it was easy to refuse”. As a result Ryanair withdrew from Manchesterwith the exception of the Dublin service. About a tear later they came backpresumably after paying the higher fees.