6d) 50 left Tuvalu to swim round a new group of islands (7) V?N????
13d) It thankless but great fun working in middle of Hull (10) ???R?T????
20d) Egyptian leader played a harp? I'm surprised1 (7) P??????
27a) Spread out aquatic mammal, last bit first (7) E?????E
28a) Batting felt wrong, Cook's first in - change ends (7) I?????T
29A) I'll cut cast - everyone in cast and dither (6,6) ?????Y ?H????
Thanks for your help in advance, is it more difficult today?