The project extends the agency's relationship with M&SFS. It is already working on the launch of the company's combined loyalty and credit card, being trialled from this week.
M&SFS' savings and investments products include unit trusts and ISAs.
The appointment comes at a time when M&SFS is boosting its in-store presence to create greater synergy with the retail business. This month it opened two financial centres in stores in Glasgow and Edinburgh, adding to the existing 15 across the UK (Marketing, October 3). The company's marketing is headed by marketing director Alistair Milne, who joined from Egg in March of this year.
TBWA/GGT Direct is one of three below-the-line agencies that works with M&SFS.
Black Sheep works on the loans side of the business and Rapier is involved in branding work. An M&SFS spokesman said that its relationship with TBWA/GGT Direct is currently "on a project basis, but with a view to a more long-term fixed relationship".
M&SFS launched a pilot scheme for its loyalty and credit card across nine stores in South Wales earlier this week. One point for each pound spent will be earned and customers will also be able to collect bonus points on certain products.