Honour First by Herbert Strang

Honour First - A Tale of the 'Forty-five.

Honour First - Historical novel for teenagers about the adventures of a young man just before and during the Battle of Culloden of 1746, the culminating event of the Jacobite Rising, during which Bonnie Prince Charlie landed in Scotland with the help of the French, invaded England, and tried to take the British Crown.

Excerpt:
One of his shoelaces snapped.
'Hang old Capplethwaite!' he said explosively, throwing the broken end across the floor.
He sought a new lace, and threaded the eyes with a roughness that threatened another break. Every now and then his lips murmured. Had he uttered his thoughts aloud they would have composed a long tirade against 'old Capplethwaite'. 'Why did my father make him my guardian? What has he ever done for me? Paid my school fees—with my father's money. Paid John Seddon for my keep—with my father's money. What else? Nothing: the old skinflint. Keeps my father's money snug, he says, till my coming of age. I wish I were twenty-one to-day instead of sixteen. He wouldn't keep me here another hour.'
'Hang old Capplethwaite!' he said explosively, throwing the broken end across the floor.
A woman's voice called him from below.