There are many types of financial institution to choose from...

[MrsTerryPratchett]

Or institutions?

I have no idea and everyone in my office is disagreeing.

Please help.

BTW I'm in Canada and British. That may be where the disagreement lies.

I would say institution, but I clicked your thread so I could ask a question in this topic so you should probably ignore me

Illiterate leading the illiterate?

I would say institution. I'm not clever enough to explain why though 😬

Institutions - many types = plural.

There are many different financial institutions
Or
there are many different types of financial institution
Like a pp I do not have the technical terms to prove this.

The plural in this sentence is "types [of institution]", so you don't need to add another plural into the sentence.

But I would re-word it to: "There are many types of financial institution from which to choose..."

Thanks lovelies.

I find it hard to say if there is a hard and fast rule. Sometime "types of" + SINGULAR sounds right, sometimes "types of" + PLURAL does, especially if the plural is irregular:

I prefer certain types of men [man sounds odd?]
I work with three types of child [children might work]
I eat certain types of apple [apples definitely doesn't sound right to my ear]
These shoes only suit a few types of foot [but feet might work]