- The new boss of HS2 was also former chief executive of the UK's Olympic Delivery Authority
- Sir David takes over as chairman from Doug Oakervee who announced he will be standing down at the end of the year
- Sir David Higgins will get an annual salary of £591,000
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The man was taken early this morning to a south London police station where he remains in custody.
Officers arrested a 15-year-old boy in Stratford on Saturday night on suspicion of grievous bodily harm.
Six people were injured after they were hit with the substance during an "altercation" between two groups at a shopping in east London.