http://track-chinapost.com/track_chinapost.php?code=RM649260767CN shows your item left Zhengzhou for the UK on 21-Oct:

2015-10-20 14:53:43.0 郑州帐单center received
2015-10-20 16:16:26.0 郑州帐单center customs scan
2015-10-20 20:06:22.0 leaving 郑州帐单center ，next station 郑州international
2015-10-21 14:26:21.0 郑州Transit Station export security scan
2015-10-21 14:52:48.0 郑州Transit Station export customs cleared

However, if you try to track your item on http://www.royalmail.com/ you will get:

Royal Mail Signed For™ items are only scanned when the item has been delivered. Depending on whether the item was sent 1st or 2nd class, this may be a few days after posting. Please try again later.

It should have arrived in the UK by now -- it's been 16 days since leaving China, and average transit time to the UK is 12 -- but because Royal Mail doesn't scan Registered items until they are delivered, it's not possible to know the item's exact location or when it will arrive.