We've been debating the following SEO question at our office:

If you block bot access to a page either via robots.txt or on-page noindex metadata, does that negate the value of any backlinks to that page?

We have a client who wants to block some event booking form pages from being indexed as each booking form page has a unique URL parameter and the pages are "clogging up" the Google index; however lots of websites link to those booking form pages and we wouldn't want to lose the value of those links.

Any opinions welcomed.