Like a great many airports today, the homogenisation of fleets and aircraft types have rendered variety a thing of the past. LTN has an ever changing biz-jet quotient, but as you say the 'good old days' are long gone. Probably the mid 90's was the last period where interesting types were regular visitors. Oh well, be thankful that you were able to witness, see, smell, feel the nostalgia back when it was the day to day.