It is imperative before launching a product under a new brand that a search is conducted through the databases of the trade mark registers of the territories where the product will be used to ensure that a similar trade mark is not already registered. A search through Google or some other search engine is not sufficient. This usually avoids letters such as that received from X Limited. As to dealing with the letter from X Limited, the response would depend on whether the trade marks and products/services are the same or similar and in some instances whether X Limited has used its trade mark. In most instances we are usually able to settle the matter without the necessity of expensive litigation in Court.