Since posting earlier, most of the numbness has actually gone! Sod's law!
Thanks for the link, that's how I'm doing it and have been trying it for a few months now but it's only really started working for me since I got chalk last week. The bars at my gym are quite thick so I've found it irritating. I was just mainly wondering if it was something I'll get used to or if it was something to be concerned over. So in this case it'll come and go I guess until I've got that callous there (which is already forming!).
Thanks for the advice.
You'll get use to it.
It took me a few months to get use to doing hook grip. Hurt like a ..
.. I use to have to dip my hands in ice water after lifting. But I have tiny hands. It's bit harder if you have small hands.