The only thing I can suggest Dan is go back to them and ask them, see if they can give you any ideas, they may be able to correct it?
front 02 sensor is fueling if its knackered then your going to over fuel. change it out jobs a good un. are you decatted? im not being funny you said youve had the light on for 5 months and not sorted it? fwiw I always leave my car in gear for that very reason. hamdbrake adjustment is very fine adjustment.. doesnt take much to go the wrong way. speak to scott hes a stand up lad. cant sort the problem if he doesnt know eh.
