Ive had the coopers english bitter, with 1 kg brew enhancer, and 500gms light dme on the go for about 2 1/2 weeks and its been stuck at 1020, OG was around 1050. Its been stuck for over a week, and ive gave it a stir and stuck on the heat belt for longer periods but no change. Last night i gave it another stir and added rehydrated nottingham yeast but no change when i checked this evening.I have just bought yeast nutrient for future use, but would it be worthwhile adding it to this brew? Any help welcome guys.