If you have only recently bought the Dulux paint, then there is not much chance of it being the problem they talked about on Watchdog. This problem happened when they had to change the make up of the paints to conform to the new EU standards. These have now been done and any old paint should have been taken off the shelves.
Did you wash off the sugar soap afterwards as this can leave a slippery surface if not. I know they say a undercoat is not needed but if you were to use one then that would give the Satinwood something good to adhere to. A primer should not be needed as the wood has already been painted and would only need to be used on bare timber. Quite often these quick dry paints do not like sticking to oil based ones. I worked in the decorating trade for many years and never had any faulty paint unless it had been stored wrongly, ie left out in too cold weather, my own fault. I have nearly always used Dulux and always find them to be about the best. Yes they were on Watchdog but then so have Crown for their paint as well.