There are at least three different overprint patterns for T. Tapling & Company. But what of the company itself? The Peerage lists many Taplings, including a Thomas Tapling whose daughter married in 1896, which would be roughly the time the first two stamps above were used.
Today there is a Thomas Tapling and Co. Ltd. at 65 Hazlewell Road, London, SW15 6UT. However, I cannot confirm that this is the same company that used the commercial overprints that you see here.