Can anyone recommend a good Plugin?

What do you mean by "Light weight". The amount of code is no indication of lightness or effectiveness or efficiency or efficacy of a plugin. I'd highly recommended you search the Plugin repo and pick the plugin that has the best reviews and most downloads... can't go too wrong with the majority.

Hi there,

This is the one we usually suggest:
https://en-ca.wordpress.org/plugins/velvet-blues-update-urls/

Not sure if it's lightweight or not but it works from what we know.

Thanks Leo.

@Pete I assumed any plugin that is feature rich, usually laden with features that you need a certification in computer science to understand, let alone use, and that I'm never ever in a month of sundays going to need to use, are "bloated" and "heavy" resourceful plugins.

I've installed this:
https://wordpress.org/plugins/broken-link-checker/

Just a bit concerned it might be resourceful and slow my site down.

You can always run a speed test before and after using the plugin.