Took van to SLM Vauxhall tunbridge wells .After several visits they claimed a van that was just over four years old and had done 30 000 needed a new catalytic converter at a cost of over £1400.00 This was their diagnoses for an engine management light being on. We went ahead and let them change the CAT believing that this was the issue and they are the professionals .How wrong was we !!!! Picked up van after Cat was changed drove 2 miles and light came back on .Took van straight back and after they looked at it they said DPF was blocked due to CAT breaking down. Common sense should of said ok CATS breaking down we will change that and then remove the debre in the DPF but no not at SLM !!!! So over £1400 spent and nothing fixed and SLM are now saying I need a new DPF that will cost another £1400 plus !!! . Van had a new DPF and add blue sensor earlier this year I would not recommend SLM and certainly would take another vehicle their . Complaint is being escalated externally