What is the purpose of banning labor unions in britain?

Trade unions in the United Kingdom were first decriminalised under the recommendation of a Royal Commission in 1867, which agreed that the establishment of the organisations was to the advantage of both employers and employees. Legalised in 1871, the trade union movement sought to reform socio-economic conditions for working men in British industries, and the trade unions' search for this led to the creation of a Labour Representation Committee which effectively formed the basis for today's Labour Party, which still has extensive links with the Trade Union Movement in Britain.