The Virgin and Delta sites seem to be down at the moment, but this fare is available on Expedia.co.uk

I believe the fare is only available today so book fast.

I cannot see anyone else matching at the moment.

These are the fare rules:

Advanced reservation / ticketing

Reservations for all sectors are required at least 28 days before departure. Ticketing must be completed within 14 days after reservations are made or at least 28 days before departure whichever is earlier.

Minimum stay

Must include a Saturday night stay.

Maximum stay

Travel from last international stopover must commence no later than 3 months after departure of the first international sector.

Sales Restrictions

Reservations must be made on/before 28aug 15.

Tickets must be issued on VS or dl. Tickets may not be issued by PTA.
NOTE – In the event of death of a passenger en route ticket validity of persons accompanying the passenger may be extended for up to 45 days from the date of death as evidenced by a death certificate. In the event of death in the immediate family of a passenger who has commenced travel the validity of the passengers ticket and those accompanying them may be extended for up to 45 days from the date of death as evidenced by a death certificate. Or – Tickets must be issued on VS or kl. Tickets may not be issued by PTA.
NOTE – In the event of death of a passenger en route ticket validity of persons accompanying the passenger may be extended for up to 45 days from the date of death as evidenced by a death certificate. In the event of death in the immediate family of a passenger who has commenced travel the validity of the passengers ticket and those accompanying them may be extended for up to 45 days from the date of death as evidenced by a death certificate. Or – Tickets must be issued on VS or af. Tickets may not be issued by PTA.
NOTE – In the event of death of a passenger en route ticket validity of persons accompanying the passenger may be extended for up to 45 days from the date of death as evidenced by a death certificate. In the event of death in the immediate family of a passenger who has commenced travel the validity of the passengers ticket and those accompanying them may be extended for up to 45 days from the date of death as evidenced by a death certificate.

Tickets must be issued by electronic ticketing. Extension of ticket validity is not permitted.

Penalties

Changes any time changes not permitted. Waived for illness or death of passenger or family member.
NOTE – Prior to departure of the original scheduled flight – may be upgraded to a fully flexible fare that allows free of charge changes no show in the event of no show the ticket is non- refundable and may not be used as credit towards the purchase of any other fares waiver – for death/illness of passenger or travelling companion as evedenced by a death/hospital certificate – keep the original fare and rebook as required.
Cancellations any time ticket is non-refundable. Waived for illness or death of passenger or family member.
NOTE – Refunds are not permitted outside the period of validity of the ticket in accordance with iata general conditions of carriage multiple charges the most restrictive conditions of each of the pricing units will apply. Charge the highest fee of each cancelled pricing unit. When combining a non refundable fare with a refundable fare the amount paid on the refundable fare component will be refunded less any applicable penalties. The amount paid on any non refundable fare components will not be refunded. Taxes and surcharges unused government and airport taxes will be refunded. Carrier imposed surcharges will not be refunded.