Quote/ 'FR have certainly spoken to BAA recently about a base at GLA: see para 25 of this ("Ryanair had talked to BAA at Glasgow about introducing a base there, but had been told that BAA’s head office would not allow Glasgow to engage in discount arrangements.") and page 51 of this ("essentially BAA offered us [FR] the same deal at Glasgow International that we have negotiated in Edinburgh, which we would not regard as successful at all").'
The above would suggest that, should Glasgow be sold off, then FR are virtually certain to move there as any new owners will be trying to attract new business.