The fees are set out in Article 46 and Annex 2 of the Ordinance on Identity Documents for Swiss Nationals (SR 143.116). These are payable in the currency determined by the Swiss representation.

Amount in GBP
  Identity card Passport 10 Combined offer (passport and ID card Provisional passport (4 or 7 months max.)
Children and adolescents up to the age of 18 31.00 54.00 67.00 77.00
Adults 57.00 115.00 128.00 77.00
Swiss representation's delivery fee local rate local rate local rate local rate
Amount in GBP

All fees must be paid at the time of the appointment. Payments preferably with credit cards (no American Express).

Passport and ID card are posted separately (different places of production).