Jurors in Auckland, New Zealand, find a 27-year-old guilty of strangling Grace Millane.
A UN resolution in May gave the UK six months to hand back control to Mauritius.
Nigel Farage is expected to expand on the party's other goals, alongside its focus on leaving the EU.
They will be the first UK citizens to be repatriated from an area formerly under the control of IS.
The party says the money raised would go towards tackling rough sleeping.