After the phone verification, you can redeem 3500 points for 1000 avios on the BA only accounts (despite it being less than 30 days since the previous redemption on the old site). You can actually select multiples of 3500 point redemptions, but any more than 1 tells you you have exceeded the number allowed, similarly any attempt to repeat gives the same result.

Like others, I seem to have lost the option of 6500 for 2000 avios, so I'm going do be doing far fewer surveys. I got the standard email about some options not being available, but this smells to me of policy rather than teething troubles.