Pepper Money, Kensington Mortgages and Octane Capital will also attend.
The loan is at 35% LTV and has a 12-month term.
Anderson (pictured) formerly headed up development lending at Amicus Finance.
This follows Together agreeing a bridging loan in 36 hours earlier this month.
The brokerage has appointed a regional manager for Wales and the West.
Truswell announced he was leaving Together in June.
The firm delivered a 59% growth last year.
Profit before tax rose by 7.1%.
Cowan (pictured) was previously working part-time in a consultancy role at the lender.