Did you just find a file that has a digital signature from PHD Computer Consultants Ltd? If so, please read on.
You will probably notice PHD Computer Consultants Ltd when clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view additional details from the PHD Computer Consultants Ltd certificate with the following procedure:
Here's a screenshot of a file that has been digitally signed by PHD Computer Consultants Ltd:

As you can see in the screenshot above, the Windows OS states that "This digital signature is OK". This implies that the file has been published by PHD Computer Consultants Ltd and that the file has not been tampered with.
If you click the View Certificate button shown in the screengrab above, you can view all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, and so on. You can also examine the address for PHD Computer Consultants Ltd, such as the street name, city and country.
COMODO Code Signing CA 2 has issued the PHD Computer Consultants Ltd certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screencap above.
The following are the PHD Computer Consultants Ltd files I've gathered, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/55 | findinsite.exe |
The detection percentage is based on that I've gathered 55 scan results for the PHD Computer Consultants Ltd files. 0 of these scan reports came up with some sort of detection. You can review the full details of the scan results by examining the files listed above.
The analysis is done on certificates with the following serial numbers: