From looking at SSViewer it is possible to disable the output of Requirements to the template via the 'includeRequirements(true/false)' method - however I can't work out how to access the instance of SSViewer from my controller to be able to set this option.

I've tried things like this within my action:

$viewer = $this->getViewer($this->getAction());
$viewer->includeRequirements(false);
$viewer->process($this->dataRecord);

and it doesn't seem to make any difference... any help would be appreciated.

Thanks.

I'm not sure what you are trying to do, and I've never used this function. So just to make sure: are you aiming at removing one or more requirements that are, for instance, loaded from another module? In that case have a look at clearing and blocking:

http://doc.silverstripe.org/framework/en/reference/requirements