This afternoon, DECC have released the statement HERE which clarifies the Feed in Tariff situation not only for now, but after April 1st.
It has been backed up by a Ministerial statement by Greg Barker HERE which puts the decision into context and appears to show a support for the Renewable energy sector.

Both Solar PV industry and customers can breathe a little easier now, as we have definate decisions from the Government, though this may mean a mini rush for system installations during February, that should not affect the Governments budget too much which will leave them able to continue with a reasonable 21p rate after April.
See reproduced table below:

Band (kW Declared Net Capacity (DNC) Current generation tariff (p/kWh) New generation tariff from 1 April 2012 (p/kWh)
≤4kW (new build)37.821.0
≤4kW (retrofit) 43.321.0
>4-10kW37.816.8
>10-50kW32.915.2
>50-100kW1912.9
>100-150kW 1912.9
>150-250kW1512.9
>250kW-5MW8.58.5
stand alone8.58.5