Hello Ashleigh, sorry to hear this. It has been a bumper year for pests of all sorts. But next year the aphids may be less troublesome, for example in 2006 I lost many lettuce in August (the worst month always), but the following summer, much wetter, saw healthy growth throughout. Incidentally I compost all the roots of aphid-eaten plants.
I think that the root aphid is present most summers, but in wet years it thrives less and plants keep growing, so you notice few effects. Tipburn is also related to dry soil so i would be careful of planting too close to tall veg whose roots can pull moisture from quite a way away. Also try sowing Frenzy or other frizzy endives in June, they ater not affected.