I think there is a confusion in the HO reply itself....
"WORK Experience-35 points awarded.
We are not satisfied that sufficient evidence from past employers was
provided to demonstrate that your previous work experience involved
two years senior level as described in the published guidance notes of the HSMP arrangements. Therefore, points have been awarded accordingly."
This clearly states they were looking for evidences which justifies 2 years senior level experience while published guidance notes ask for 1 year only..
&
Tell me how many years total experience you have claimed, junior and senior, both..
First make sure they have made mistake in evaluation before reapply so its easy to make a valid point on strong ground, I guess
Anis