bit and subscription price differs mobile to desk top ?
Why is the price of bits and subs so much more on mobile compared to a desktop computer ? this frankly doesn't seem right to me and also why are they more expensive in the Uk than elsewhere ?

Hey there!
Payments for Bits on Twitch mobile apps are processed by the Google Play Store or the Apple App store.
Due to this, additional platform processing fees may be applied to the purchase and lead to a higher price for Bits purchases on mobile apps. You have the option to purchase bits at desktop prices on your mobile device by going to bits.twitch.tv in your mobile web browser or by visiting twitch.tv on desktop.
You can find out more here: https://help.twitch.tv/s/article/guide-to-cheering-with-bits?language=en_US#:~:text=To%20purchase%20Bits%20on%20our,or%20the%20Apple%20App%20store.