The report, from Carter Jonas and Revo, reveals that Spelthorne Borough Council in Surrey, which contains the towns of Ashford, Shepperton, Staines and Sunbury, was the biggest local authority investor committing £477.1m to assets within its domain. This is more than double its nearest rival Warrington Borough Council (£219.5m) and is largely down to the purchase of BP’s International Centre for Business & Technology in Sunbury for £360m.