Discovered last night that 2257 departure from Marylebone does not stop at Rickmansworth given that many people at stations from Ricky northwood use the Chiltern more often now that London Underground only run Fast during peak hours it seems strange that there is a two hour gap between 2157 & 2357. Had to drive to Chorleywood to collect a rather grumpy partner. I did notice that it was a 168 rather than a 165 I think five carriages, are 168's significantly longer than 165's so I guess it may be a platform length issue at Ricky.