How do you begin bringing an action for perjury under civil law?

My sister died in 2008 and my brother and myself were appointed executors to carry out her wishes. The solicitors originally instructed went into liquidation. Her Will instructed her house to be sold and paid to her granchildren reaching the age of 25, several years away at the time. Because of the economic climate, we agreed to refurbish the house and rent it.  My brother co signed an AST along with other various documents, closing  bank accounts and opening  a new one etc. We argued over his wife interfering and he went to a law firm to challenge our decision. He made a `statement of truth` claiming he had not made any agreement to rent the property and I was renting it to a friend rent free without his permission. He also made other allegations, claiming I had stolen my late sister`s jewellery etc. 

When he submitted his second `statement of truth` it totally contradicted his first statement as he hadn`t realised I had retained all of the documents pertaining to the estate, including the AST he had signed. His own solictor referred to the AST and also  provided a letter confirming my late sister` daughter had, with his permission, taken the jewellery. Only when he knew his statement was discounted, did he admit the truth. This has cost me about £1/2 million in costs. His solictor are a large aggressive company who gained advantages due to my mother dying within a few months of my sister, which caused me debilitating depression for some time after both deaths. I have eventually got over this, but now I wish to address his false claims. His solicitors refused an Order for  mediation by a Master in the RCJ, so it has taken this long to address the problem.