GS are planning a single hop 757 excursion to FL from the UK... Bit worrying.
Distance to SFB from GLA : 4200 miles
Range of a loaded 757-200 : 3900ish
Short by : 300. Better get your wellies and water wings ready or hope for a strong tail wind.
It could be an ER, i remeber some FinAir 757-200 did SFB flights out of MAN for AIr scanidic, these a/c have bigger engine's and a higher full pay load.
Although i think it tech stopped in Bangor on the way out for fuel.