Although I'm not an expert, to my mind the SFO is the valuation needed for disclosure purposes, as it's the statutory requirement.
Not sure what you mean by "regular", and one interpretation may be the valuation required by a Scheme's specifc rules. Another reason for a valuation may be to set the contribution rate, which can be different from the SFO (one example is the SFO can be a solvency test (I think) and you need an ongoing valuation to fund it).
In practice, the two are likely to be one and the same, because it's simpler to just do one valuation, and the contribution rate is determined (partially) by the SFO requirements.
However, it is important to be always mindful of the purpose(s) of any valuation, and sensible to refer to a valuation in the proper context (if there is possible ambiquity)
Last edited by a moderator: Jun 10, 2010