"that IS where you would find them yes?"
not necessarily. for instance by selecting infantry only you might get problems to get support units and expeditionary troops.
though i supposed if you disselect all filters and run through it, problem could be gone.
see:
http://forum.paradoxplaza.com/forum/showthread.php?584485-British-Exploration-Party&
not a real bug, but false classification of units
also often a problem if you got into a national filter by any way:
http://forum.paradoxplaza.com/forum/showthread.php?569488-Missing-Unit/page2&
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since UK has a strong fleet you can just run into bottle-necks even in the beginning
for the governmental values, from the manual:
"• Imperialism: Modifies your Force Pool, Unit Cohesion recovery, and ability to forge plausible casus belli
(must be 5 to do so). For example, if you have a 9 in Imperialism and max allowance of 8 infantry Corps,
then you’ll ultimately be able to raise 10 infantry Corps at one time (8 * 1.2 = 10).
• Administration: Modifies the initial cost and output efficiency of production structures – although good
transportation (such as railway development) is a key factor in productivity.
• Diplomacy: Modifies the number of Diplomats you receive every 6 months. Diplomats are expended
whenever diplomatic actions are taken, and they can also be consumed by some colonial actions. Diplomacy
also modifies the amount of Prestige you gain from your possessions in your Sphere of Influence."