As noted in my earlier reply re the speed limit changes in Whitwell, it won't be possible for you to make this edit yourself at the moment due to the block on level 1 edits. 

If the required change isn't critical (i.e. leaving the place data unchanged won't have cause any real problems for users) then you may want to wait until L1 edits are re-enabled in the near future (fingers crossed!).  Otherwise please let us know what change is required so we can get it done ASAP.