Ion heat transport studies in JET by Mantica, P, Angioni, C, Baiocchi, B, Baruzzo, M, Beurskens, M, Bizarro, J, Budny, R, Buratti, P, Casati, A, Challis, C, Citrin, J, Colyer, G, Crisanti, F, Figueiredo, A, Frassinetti, L, Giroud, C, Hawkes, N, Hobirk, J, Joffrin, E, Johnson, T, Lerche, E, Migliano, P, Naulin, V, Peeters, A, Rewoldt, G