I vote for one of Willie Manson's from his unlimited editions "Scotia Range", 1980/1. The catalogue pages shown in John Simmonds' book Paperweights From Great Britain, page 150 has an example and it has the alternate cane structure in the circle around the central cane.
If I am correct, and it is from the Scotia Range, then the name of the weight is "Satin Chain", not "Latticino". And it probably originally had a "Scotia" label on the base.
As for the "heart cane", maybe it is a heart. But it could also be a happy coincidence formed from the way the cane was affected during working of the weight. Many regular round millefiori canes gets "squashed" into a sort of "heart" shape. The effect is also apparent in the central cane in this weight where the orange-coated element at the 4 o'clock position in photo dscn0959b also looks to have a "heart" inner section.
If the ground had been clear instead of filigree, the actual form of the canes could have been easily seen through the base as they do not get distorted very much at that end.