There are two SIPs - the original one started by Paul Clarkson, website at http://www.scottishindependenceparty.net
and the 'new' one just announced which seems to be a chimera. It did have a free Wix website
for a while,. but that has since disappeared.
I suspect it is just another utterly fake 'grassroots' organisation similar to the NoBorders group that reared its head during the referendum campaign.
Neither the 'old' or the 'new' SIP pose any threat to the SNP vote in next year's Holyrood election. The latest poll suggests an SNP landslide with an increased overall majority. Support in the constituency vote is running at 62%.
There will be all sorts of attempts to split the SNP vote, and I predict they will all fail as miserably as the 'tactical voting' campaign in the recent general election. (which resulted in 56 out of 59 seats returning SNP MPs, just in case anyone forgot).