[TDO Tag Fixes] Link to tag within category

hi all,

I’m building site for an art gallery at the moment and stumbled across the TDO Tag Fixes plugin which allows you to get posts with tags from a specific category:

https://your-blog-uri/?cat=35&tdo_tag=tag1

I have all the artists in the gallery set up as categories. What I would link to do is set up a semi-dynamic link in my category.php page so that users can filter the category by pre-defined tags (original painting, prints and sculpture):

<a href="<?php get_cat_id(); ?>&tdo_tag=Original">

I would replicate this link for each of the tags as described above.

Unfortunately, this doesn’t work. Can anyone offer any help as to how I can get the cat the category ID and use that in combination with the TDO tags?

Cheers.

[Edited above as I forgot to use the code markup – d’oh!]