LONDON (Reuters) – Britain will this week begin offering vaccinations to children aged between five and 11 who are most at risk from coronavirus, the state-run National Health Service said on Sunday. Britain has been slower than some other countries in offering the shots to 5-11 year olds, and is not planning to vaccinate the age group more broadly unlike countries such as the United States and Israel. NHS England said children in the cohort who were in a clinical risk group or who live with someone who is immunosuppressed would be able to get a first COVID-19 shot, in line with advice issued …