Xiaobolin - thank you for your very detailed instructions, and I must admit I was very excited the minute I read your post.
I have been trying the site for the last two days, and on my perhaps sixth or seventh attempt of downloading the ROOT zip, it did get ahead ..... to about 1Mb or so and I then got the message "The file you are downloading is not supported". On the earlier attempts, it just failed to even download at all.
Is this the only site for the ROOT file?
Again, many thanks!!!!
BTW, referring back to my own earlier post - I have since got home and stuck in my home SIM card, but the phone is still locked ...... so it is indeed clear that the ROOT needs to be dealt with, as pointed out above by Xiaobolin.
I will also explore whether someone can help me download a totally new and international Android OS onto the handset and replace the China Mobile version ......