Hey Paul
IMHO I think it's a scandi vase. I have seen numerous pieces purported to be Whitefriars which all have one thing in common, a completely spherical pontil mark such as this one. I know it sounds a bit daft but they are always perfect circles and quite unlike the standard Whitefriars pontil mark which is quite uneven. Annoyingly I can't remember the name of the Scandi manufacturer but it might just put you on the right track!? regards
Simon