Emergency landing at Leeds Bradford Airport - Yorkshire Evening Post
Report says that G-GDFE (Boeing 737-300QC) (operating flight LS509 [NCL-PRG]) had diverted to LBA this morning as a precautionary measure, after there was reports of smoke in the cabin. The aircraft landed safely without any passenger or crew injury at 11:24GMT
I can also confirm that the replacement aircraft G-GDFL, which was parked at LBA at the time, departed just over an hour later at 12:31GMT, as EXS509A.