NCT classes worth the cost?

Not sure if this is something national or local, but is anyone familiar with and participating in NCT classes? This is my first baby here in the U.K. (3rd total) and went to sign up for NCT course (3 sessions, 2h long each). I was shocked at the price - £171. Has anyone else signed up for these or can offer insight if this price is worth it? I have a hard time justifying that cost, but hear it’s a great way to immerse yourself as a new mom in your local community.