thinking of buying one of these http://www.hattons.co.uk/83443/Heljan_8920_Class_128_parcels_DMU_55991_in_BR_blue_with_yellow_ends_Parcels_Service_/StockDetail.aspx
looked at assorted sound chips and they all seem to be generic as none were saved for preservation so looking at cost which if any would be the best match from the Hornby chips