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Commuting for about 18 months 21mi round trip. Started doing regents laps and rollers about January and starting doing some of the British cycling plans in Feb. Before that was playing rugby to a fairly high level.
velohobbit-
Then I'd expect more gains than you've found, based on a relative lack of intensive on bike training before this level.
It could be that the high level rugby means you're very well trained already though.
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I've just had a look at that BC training plan.
For a start, four weeks isn't much training to expect much return. Also, the plan involves a lot of vo2 and anaerobic work. While it's important to train all the physiological systems, gains in FTP are about muscular endurance and spending ever increasing times at threshold. So, lots of over/unders and increasing intervals at sweet spot/threshold.
TTM
Gains at FTP will depend largely on how well trained you are already. They're much easier to come by for those that are relatively untrained.
What's your history up to now?