Just as a by-the-by, "HMT" can also mean 'Hired Military Transport'. Don't forget that many of the troopships used by the military were often commercial liners and mailboats which were converted to be troopships.
Trying to find out what ship the B10 was, but not meeting with much success so far.
As far as the handwritten section on page one is concerned, much of it seems to be about the training courses Ronald went on. I'm assuming Weldr and similar grouping of Weld all mean "Welder".
"Joined for Subs. Welder Acetylene Course. Passed Subs. Welder Acetylene course, reclassified Welder Acetylene B III.
Proceeds No2 Birmingham Technical Training Group for basic Electrical Welder course on.....
"Passed Welder Electrical basic (

) on 25/10/44. Classified Welder Electrical Group D with effect from 25/10/44.
(I think the next bit is) Remain attached for Sub basic (??)
Passed Welder Electrical Sub Course on 8/11/44
(something) to Mobilisation and Holding Centre REME with effect from same date.
Classified Welder Electrical Group B Class III with effect from same [date].
Returned to Unit on9/11/44, Ceased To Be Attached this group with effect from 10/11/44.
RRTB