I like to think I am a person of reasonable intelligence...

[nordstrom]

...but give me a loaf tin and a piece of baking parchment and I am well and truly beaten!

I am about to lob said loaf tin at the fucking window in a rage

So, if anybody has the answer so that my banana loaf might be saved, I would be most grateful!

I buy the liners too. But if you make four cuts into the corners the paper will go in. If there's too much overlap, cut a bit off.