How to get a British Airways companion voucher with the BA Black card without paying the £195 joining fee...
When you book a flight using Avios, you can use a companion voucher to get the same flight for a second passenger without using any more Avios - essentially two for one - hence why these vouchers are incredibly valuable.
Note that you have to pay taxes for both flights.
You have to have an AMEX card to be able to use your companion voucher (i.e. don't cancel all of your cards...).
The best use of a companion voucher is typically to book a long-haul flight in Business Class or First Class.
If you earn a companion voucher using a BA Bule card (£20,000 of spend needed) you only have one year to use it.
If you earn a companion voucher using a BA Black card (£10,000 of spend needed) you have two years to use it.
Having two years to spend a companion voucher is a massive benefit as it can often take a while to work out your travel plans and to find availability on some routes you need to book a year in advance - The voucher that comes with the BA Black card is therefore significantly more valuable than the voucher that comes with the BA Blue card.
The downside with the BA Black card is that it comes with a £195 joining fee.
However, you are currently able to upgrade from the BA Blue card to the BA Black card, once you approach £10,000 of spend. If you upgrade (with a simple call to American Express) once you have spent £9,999, you pay the joining fee at the time of upgrade but you then only have to spend £1 before you get the BA Black card companion voucher and then subsequently downgrade. Once you downgrade, you get your joining fee back pro-rata, which means you get 11/12 of your joining fee refunded.