Depends on the contract. Here's the contract I've been bound by when writing freelance for The Guardian:
You grant irrevocably and unconditionally to GNM the following rights ("the licence") to use, publish, transmit or
license the contribution throughout the world. Unless expressly identified otherwise, all rights granted in this
licence shall subsist for the full period of copyright in the contribution including all renewals, reversions,
extensions and revivals of such period and shall be exclusive.
With the exception of Spot Sales where royalties are payable as set out below, GNM pays freelances commission fees covering all of the following rights. The value of these rights is reviewed annually.
1 Right to use, publish or transmit the contribution in all editions of the relevant Licensed Publications anywhere in the world.
2 Non-exclusive right after use in the Licensed Publications to publish the contribution in Guardian Weekly and similar publications and in other collections of material published by GNM in paper form and on-line anywhere in the world.
3 Non-exclusive right to use, store, publish or transmit the contribution in internal archives and databases and External Archives and databases including but not limited to CD-ROMs and websites published by GNM and/or third party databases and/or archive publishers.
4 Right to authorise the Newspaper Licensing Agency ("NLA") to distribute or license the distribution of the contribution for the NLA's licensed acts and purposes as amended from time to time.
5 Right to Syndicate throughout the world after use in the Licensed Publications. For the avoidance of doubt such Syndication rights include the right to enter into contracts with third parties under which such third parties may reproduce content previously published by GNM.
6 Right to make Spot Sales throughout the world for a period of 3 months after use in the Licensed Publications and the non-exclusive right to make Spot Sales thereafter. Attributable revenue shall be split between you and GNM on a 50:50 basis and your share shall be remitted to you within 28
days of each sale.
It's better not to go on feel either way. In most cases, a freelance writer retains copyright and the publication that paid for the work (in this case FT) is given an implicit license to use it.
Since he's not an FT employee, it's likely this could fit under the category of work made for hire, but unless his contract explicitly specified this is case, I believe he would retain the copyright: http://en.wikipedia.org/wiki/Copyright_law_of_the_United_Sta...
If the FT paid you to write it, I feel like it's probably not ok to post it where you'd like.