Here's a couple of single day trips (from home in Liverpool) I did in the middle of winter...about a month after I got my Z4MC in 2008...
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I also have some Google Maps itineraries from when I used to do 3-day, small group runs (the following are all based on staying in Welshpool, as we had drivers from Cornwall, Bicester and Liverpool).
The variations were just there in case we needed to shorten the route due to bad weather or hangovers...and of course all the routes will have to be re-checked for road closures/bridge closures/speed limits/anti-driver local farmers/etc. as they are at least 10 years old.
North Wales
North Wales - Option 2
www.google.com
North Wales - Option 1
www.google.com
Mid Wales
Mid Wales - Option 1
www.google.com
Mid Wales - Option 2
www.google.com
South Wales
South Wales
www.google.com