Jan 13 (Reuters) - Boaz Weinstein's Saba Capital, which holds about a 13.5% stake in London-focused flexible office-space provider Workspace, sent a ‌letter on Tuesday urging the company to pursue ​a managed wind-down.

"Considering the company's (Workspace) persistent ‍trading discount, refinancing challenges, and ⁠structural ⁠impediments in its shareholder base, the current model ‌no longer represents the ​best path to value creation," U.S. activist investor Saba said ⁠in the letter.

Saba ‍also ​accused Workspace of having a highly concentrated shareholder register, with a small ‍number of holders controlling a "disproportionately large portion" of the shares.   

The London-listed company's shares had fallen 7.6% in the last 12 months as of ​Tuesday's ‍market close. 

Workspace did not immediately respond to a Reuters request for ​a comment. 

The British firm reported a pretax loss of 71.1 million pounds ($95.46 million) for the six months to September 30 as budget uncertainty led to delays ​in leasing decisions by small- and medium-sized businesses. 

($1 = 0.7448 pounds)