luke mcgrath scotla nd rain mid—afternoon. .nd northern ireland, showers or longer spells of rain at the low—pressure approaches. temperatures will be considerably lower, down by 5 degrees. after that rain passes through, fine and dry conditions. it could be one of the warmest london marathons. stay tuned to the forecast. this is bbc news. the headlines at 8pm. commonwealth leaders agree that prince charles will, one day, succeed the queen as head of the organisation. his royal highness has been a proud supporter of the commonwealth for more than four decades and has spoken passionately about the organisation's unique diversity and it is fitting that one day he will continue the work of his mother, her majesty the queen. after nearly 22 years in charge, arsene wenger will step down as arsenal manager at the end of the season. as the clear up in salisbury continues, government scientists warn the decontamination of nine hot spots could take months. the swedish dj avicii who collaborated with artists such as madonna and coldplay,