TfL has announced that there will be a small increase in the number of 343 buses (London Bridge - New Cross) running between Monday and Friday, 7am - 7pm. Currently, one bus runs every 6.5 minutes. From February 2011, this will increase to one bus every 6 minutes, with one additional morning peak journey from New Cross to Catford.
Following complaints from some residents about noise, TfL has also confirmed that it is considering moving the start of the N343 route from Jerningham Road to New Cross Road. The end point of the route would not change. They have rejected suggestions that smaller buses should be used.
With thanks to Tamsin and Emily.