Suffice it to say that dishonesty by a solicitor is a very serious matter

Courts and regulators (quite rightly) take an extremely dim view of solicitors who fail to tell the truth or conceal matters. 

– See this post and this one.

This is because as the Solicitors Regulation Authority (SRA) says:

the public should be able to trust a solicitor “to the ends of the earth” (see here).