I have finally managed to get through to the download page on the Realtek website, and am currently downloading the current driver.
This is the current transfer rate from Realtek. Pretty diabolical, don't you think? Particularly when you compare the rate to my download speed, shown in the image below (test performed by MySpeed PC). This test was performed whilst the file was downloading.
Footnote: As I submit this thread, it has only completed 33% of the download.
Additional footnote: I have forwarded the details from this post to the Webmaster at Realtek. Will be interesting to see what the reply will be.