redirection never works right after a new user registers.

This module is used only for redirection after login.
To have a redirection after registration please use logintoboggan.module

As I know there should be a setting in logintoboggan.module where you can specify the URL to be taken to upon registration. Or I'm missing something....

However,

I require that users be redirected to the page where they clicked my link 'Register to apply for this job', which then takes them to the registration page.

Once a user is registered, I need them to be redirected to where they decided they wanted to register. Rather than having to re-navigated/search for the content (in this case job) that they want.

Is there a php snippet that I could use with the logindestination module to achieve this?

Many thanks

Paul

Hello.
This module doesn't handle redirection upon registering at all. It is only used for redirection upon logging.
logintoboggan.module will probably help you. If not, you can request this feature on that module because logintoboggan is an extension to handle everything connected with registration process.