Might have been something to do with the £5 statement credit for spending at certain retailers, or the tripadvisor paying £5 to write a review, I think they took away 5 MR from me when that posted
Don't think it's that as I've had hundreds of bonus avios posting for transactions at Harrods, Peter Jones, Waitrose and Amazon.
It appears to be an extra avios for every pound spent since 9th January.