In reply to jdw_usa: Something to get your head around before getting to the UK is our weather and geology and how that affects choosing which crags to climb on.
First, the majority of our larger and best mountain crags are located in Northerly facing cirques formed in the last ice age a mere 12,000 years ago. The nature of these crags is they often require 3-5 days of dry weather to come into condition. That, as you may guess, happens more rarely than we would prefer given our wet, maritime climate. As such, amongst keen trad climbers there is a distinct hierarchy of crags. Whenever it is sunny and the high mountain crags are dry – you should seize the chance and climb there. Equally, many of our more popular crags (including many Gritstone ones and North Wales Slate) partly owe their popularity to their quick drying nature. As such you don’t need to make too much of an effort to climb there, you will naturally end up there during poorer weather.
It would be very remiss of you to spend time around the Lake District and not climb on the likes of Scafell East Buttress, Central Buttress or Pillar Rock. However, over a couple of months these crags will only be in good condition for a handful of weekends and you could easily miss the opportunity if you are too rigid in your planning. The same applies to Clogwyn Du'r Arddu (Cloggy), the historic crucible of Welsh climbing.
Second, despite being a small island, our weather is rather localised. Pretty much every day there will be somewhere in the UK where you can get a decent day of trad climbing done. [Even in the notoriously wet July and August of 2007, I managed 30 days of quality trad climbing only losing one day to bad weather, albeit by racking up a stupid number of miles driving.]
The biggest asset to trad climbing in the UK is flexibility and a willingness to adapt and follow the weather.
If you want some further inspiration consider buying a copy of ‘Hard Rock’ by Ken Wilson. It preceded Roper & Steck’s ‘Fifty Classic Climbs of North America’ by several years but has a similar iconic status. It records sixty of the best UK climbs (mostly graded 5.9-5.11) established by 1970 of which well over 50 are still considered classic routes of national renown. Equally usefully it provides an interduction to the majoirty of the UK's major crags and climbing venues with not more than perhaps 3 omissions at that grade range; Fairhead in Northern Ireland (a 5.10 crack climbers paradise - in between the rain showers!), Pembroke (stunning steep, well protected limestone sea cliffs) and the Island of Lundy (immacualte Granite).
Anyway, enjoy your planning and look forward to seeing around online on UKC.