Sure this is a total no brainer, but doesn't hurt to be told that!
Need a flight to dubai in around 4-6 weeks time, min of prem ecconomy.
BA yesterday/today is showing a shade under 770 + 20k miles to upgrade
Silverjet has a sale price of 880 (+5% back via quidco and 5% discount code)
so essentially, identical fares.
Tier points arent too much use - wont make the threshold this year.
Worth a try in Silverjet? What's the valet service like? - having images of the valet service that was on watchdog a while back!
Cheers!