Need help finding chinese travel agencies in London

We are going to London for 9 days/8 nights. Need help finding a London-based chinese travel agency. Or any chinese newspaper with  a website, where I can find classified (ads) online. 

My plan is to spend 3 days on a guided tour to Peak District, Lake, and Lock Ness, a day trip (guided tour) to Stonehenge and Bath. The rest of the time, we will tour London by ourselves.

My parents went on a 12 day, 7 countries tour 10 years ago. I would like to give them a different experience, 1 country a year, with more depth . My hu*****and and I and our two young kids are going for the first time.  My bad, planning this last minute, as usual.

Thanks much.