What is the best way to get to Suqian from London UK

There is no direct flight. You may need to fly from London to Shanghai first.

Upon arrival, you can take a long-distance bus from Shanghai to SQ; the duration is about 5-6 hours.
Or you can take a bullet train from Shanghai to Xuzhou first (2.5-3 hours), then take a bus from Xuzhou to SQ (about 2 hours).