Are you diverging a bit with pak128.britain-ex and pak128.britain?
headquarters/ May 17, 2010 ADD: Headquarters (WLindley( ADD: GWR County cl... [jamespetts]
hq/ May 31, 2010 Add HQs [James Hood]
It looks like you integrated it in parallel, in a slightly different way.
"up to date syntax for tram waytypes" was also added independently, but perhaps the change was based on a patch from jp.
Looks like jamespetts got impatient for the hq graphics to appear in standard. I don't really check experimental as I don't have time as it is. I would suggest that either (a) ex waits for something to appear in standard before implementation or (b) if I'm being really slow, jamespetts or whoever sends me a PM to let me know something is in ex that hasn't been put in standard. This should reduce instances like this in future.