>It would also be interesting to know what altitude they were travelling at during most of the rest of the journey from Luton and what effort they made to fly higher when flying over terrain chock full with mountains as high as 1085m.<
For what it may be worth, my BaseStation log shows the aircraft at 2700ft between 1227 and 1253. At that altitude my site is probably line of sight to the Rhinog area at 1090MHz.