Not yet advertised on Tesco's Clubcard Boost pages (tho Avios's comp is) but as stated on Virgin's Tesco partner page:
Extra 20% bonus miles when you convert your Tesco Clubcard points into Flying Club miles between 1 August and 16 September 2016.
(Reports from other places that some have been emailed the offer and/or have already received 20% from autoconverting vouchers so it seems to work)
Plus 1,000 mile boost to your account when you choose to Auto Convert - "for first time only"
"Lost" a few thousand miles by converting at 15% last time with the last spoils from Topcashback but I'm working on the basis that each bonus might well be the last one...
Extra 20% bonus miles when you convert your Tesco Clubcard points into Flying Club miles between 1 August and 16 September 2016.
(Reports from other places that some have been emailed the offer and/or have already received 20% from autoconverting vouchers so it seems to work)
Plus 1,000 mile boost to your account when you choose to Auto Convert - "for first time only"
"Lost" a few thousand miles by converting at 15% last time with the last spoils from Topcashback but I'm working on the basis that each bonus might well be the last one...