Thanks for all the responses, info and opinions.
I suppose the question I was trying to get the answer to was;
Why are (in my humble opinion, and in the opinion of a number of others) Ryanair landings often harder than those of other airlines?
and NOT
Why are some landings harder than others?
Again I am certainly not having a go at any one or criticising anyone's skill.
Dan
PS earlier point about tightness of the seatbelt taken.