I have a 2 year VCL Subscription ending Jan 2021 however I noticed that the VCL UI pack under my account has a "Registration valid until date" of Jan 2020.
Does this mean I'll have to renew the VCL UI pack separately and if so why since I'll only be half way through the subscription?
No, your TMS VCL Subscription was purchased with 2 year of support & updates so this also applies to TMS VCL UI Pack that is now in TMS VCL Subscription, so, just like all other products in TMS VCL Subscription, you receive updates & support for 2 years.
As a stand-alone product, this switched to a 1 year subscription.