Ok, found who it was and have some information but have looked into this further and thought I would post this on here as it may be worth people asking about these creams, especially for TN but also for GPN if you are having trouble controlling it.
The cream that was suggested was Gabapentin ^%, Lidocaine 5% and Capsaicin 0.025%
There are many combinations of compound creams and many advantages for use of these. Things such as if you experience terrible side effects from oral, the side effects are reduced topically. If you experience break through pain on orals this can help bridge that side and bring things back under control.
In this link below there is a link to a doc or pdf file which you can print out and take to your specialist or GP to discuss this option for those interested.
http://thepainsource.com/topical-compounding-creams-used-in-pain-ma...
Here is another link for general information and combinations
https://lawrencepharmacyrx.com/compounding.php
http://www.bbpharmacy.com/paincompounding.html
So do discuss this with your specialist and/or doctors about this option as either an alternative way to try and treat your pain or an adjunct therapy.