[Churchill's] proposed actions were challenged by Chief Medical Advisor Dr. Horation Donkin.

Missed opportunity to say Dr. Donkin dunked on Churchill

This is not legal advise, just obvious things, but still worth mentioning.

Always check terms for:

• what methods the lender can use to calculate an increase in interest rate.
• when the lender can exercise the right to increase.
• how and when the lender is required to serve notice of those increases and when are you deemed to have 'received' notice.
• penalty provisions for defaulting.
• rights reserved for you and the lender to terminate the loan agreement.
• consequences of termination.

I guess basically just plan for the worst case scenario and consider if you could absorb the cost of default/termination.

I'll concede that it's worth asking a lawyer before making a decision.

I just question whether the amount of money that op may get, is worth any potential fallout.

And yeah, I have experience working in law firms, just not as a lawyer yet.

You might, but the costs of pursuing an action (money/stress wise) are almost guaranteed to outweigh any monetary benefit. I'd say it's not worth bothering over unless they use it as part of a reason to fire you, then the benefit of suing increases.