At ChimneyGone.com we supply the brackets and fixings to allow you to support your chimney in the loft. The stack removal and installation has to be carried out by other. It is essential you use suitable experienced construction professional.
Reputable Local builders in your area can be found on sites such as the Federation of Master Builders and Checkatrade. A good tradesman should be able to help you if you to fill in any of the questionnaire if you are unsure.