Kew researching yourself or Employing Researchers etc

You can write to TNA and this is the kind of sound advice they might give 

With the information you gain from a research guide,  there are  three ways for you to proceed:

1. You, or someone acting on your behalf, are welcome to visit us to do the research yourself. Our staff will give you advice free of charge. For visiting details, please go to http://www.nationalarchives.gov.uk/visit. The only payment would be if you then wanted to buy copies from our Record Copying Department. You can take photographs of documents using your own digital camera, under certain rules. For details of both options go to http://www.nationalarchives.gov.uk/recordcopying/.

2. You can hire an independent researcher to carry out specific or wider-ranging research for you, both at The National Archives and in other relevant archives. For details, and for a list of independent researchers who conduct research at The National Archives, look at http://www.nationalarchives.gov.uk/irlist/

3. You can use our paid search service, if you have a specific request: we cannot undertake wide-ranging research. We will reply to your request within 20 working days of receiving it, excluding any days between asking for and receiving your payment. For details go to http://www.nationalarchives.gov.uk/foi/research.htm.

We wish you every success in your research, but please be aware that the records in our custody are not always complete: they were not created or kept for research purposes, but for use by the government or law courts of the day. We cannot guarantee that you will find what you are looking for.

---------Thanks to TNA for the above----------

Do read the TNA advice - http://www.nationalarchives.gov.uk/visit/

So if you need to visit Kew see Kew visiting  and accommodation near TNA (PRO)  
or employ a researcher see Researchers for UK