Some 19 in every 500 homes in the City of London are currently unoccupied.
The brokerage has appointed a regional manager for Wales and the West.
The society launched a shared ownership range in April last year.
Rates have been cut by up to 0.32% within the purchase range.
Duncombe emphasised the importance of maintain your client base.
Mortgage completions rose by 15% year-on-year.
The average SVR has rose by 2.59% from 2017.
Profit before tax rose by 7.1%.
FSE London was held at Old Billingsgate on Wednesday 11 September.