Flt Lt SeanCunningham, from Coventry, died after the parachute failed to open when he was ejected while on the ground at RAF Scampton in November 2011.
Their record crowd went to watch a Saints squad packed full of world-class names such as Paul Wellens, Sean Long, Leon Pryce and Welshman Keiron Cunningham.
Gidley soon put the home side back in front when he latched on to a neat pass from dummy-half Keiron Cunningham to bundle over from five yards in the corner, converted by Sean Long.