3 days ago I decided to take advantage of the BA bonus and transferred all my points to my BA account. I went on to their rewards website and chose the BA avios. I had to enter the amount of BA avios I wanted to buy (being 1.25 x the HSBC points I wanted to use). After entering my BA avios number, I got a confirmation. About 48 hrs later, the avios were credited to my BA account. To my surprise, the amount was higher than the amount I had expected. In fact it was 25% more than the 25% extra notated on the HSBC website!!

For example:
50,000 HSBC points
Used 50,000 points to purchase 62,500 Avios (according to HSBC rewards website)
When Avios were credited... I received 78,125! (that is 25% more than 62,500)
That actually works out to a 56% bonus!!

Not a bad deal. Especially since the HSBC points were not doing me any good just sitting there!