The decision on LGW fleet replacement is ongoing at the moment. Currently either the 737NG or the A320NEO are the front runners. However, as the restructuring of the management tree has given us 'Chief Pilot Boeing' and 'Chief Pilot Airbus' I have a feeling the SH will, possibly, remain Airbus.
All IMHO of course.
(I doubt they will bolster the 734 fleet with more aging, check heavy aircraft!)