Valdor at Spank Statement followed up an online reference to a 1950s novel with spanking in it, by the simple expedient of sending somebody to fetch it from the British Library in London. There proved to be an entire chapter (called “Marjorie Gets Spanked”) in Castle In Northumbria by Lorna Hill (1953):
Meanwhile, Guy had got the fire going, for which fact we were very grateful. It looked cheerful, anyway, even if there wasn’t much warmth in it. Presently he sat back on his heels and announced with deceptive quietness:
“And now, Marjorie, you’re going to get that spanking I’ve so often threatened you with!”
Esme and I gazed at him in awestruck silence. As for Marjorie, she sprang to her feet and whirled round to face him, turning red and white by turns.
“How dare you!” she yelled, her hair flying and her dark eyes positively flashing.
“You made fools of us all,” Guy said sternly. “You made Esme cry. I vowed, then and there, that I’d give you a hiding, and I’m going to. So you may as well face up to it.”
“Face down to it, you mean! Toby said with a grin.
“Go on, Guy! Put her across your knee and let her have it! She deserves it! Why should she always get off scot-free?”
“You forget I’m a girl!” yelled Marjorie, her eyes wide with fright.
“That’s your fault,” Guy said calmly. “When you don’t behave like a girl, how can you expect us to remember the fact? We’ve treated you like a girl too long, if you ask me! Any way, you’ve told us often enough that you wished you were a boy, that you wouldn’t mind being licked.”
“I didn’t mean it!” Marjorie said desperately. “Honestly I didn’t!”
“Well I can’t help that. You shouldn’t say what you don’t mean. Anyway, you’re going to be treated like a boy now, whether you like it or not.”
“You daren’t do it!” she exclaimed, very unwisely, as she’d have been the first to realise if she hadn’t been so het up.” You daren’t! I shall tell my father!”
“There are a good few things you’ll have to be telling your father, I’m thinking,” Guy said dryly, giving the fire a poke and standing up.” But that can wait until afterwards.”
Marjorie changed her tactics. She put on her meekest and most pleading expression.
“Please, Guy she begged, her eyes full of tears, “please let me off. I’m sorry—-honestly I am. I’ll apologise.”
“You will,” agreed Guy pleasantly “after the spanking.”