This post is for those members who dont know how to clear their Internet browser cache on their PC / Laptop.
Full Instructions are available in each Spoiler.
Each time you access a file through your web browser, your browser stores it. By doing this, your browser doesn't have to newly retrieve files (including any images) from the remote web site each time you click Back or Forward. Sometimes websites (like giffgaff's when you get errors topping up or using a voucher) dont like this and requires you to clear your browser cache.
Internet Explorer (IE) 11 Browser
Google Chrome Browser
Mozilla Firefox Browser
Torch Browser (similar to Chrome)
Lunascape 6 Browser
Edited 24/04/15 to add Avant & Lunascape 6 browsers