Routes from Ulpha to Wasdale are a bit limited and would involve a fair amount of tarmac, mud and hike a bike (which we all love right?). if you have to ride to Wasdale though:
Road NE from Ulpha to climb BW past Wallowbarrow Crag to Grassguards. Continue NE onto forest road, turning left below Kepple Crag to pick up BW which flanks SW side of Harter Fell and pinball down the rocks to Eskdale (foot of Hardknott Pass).Head W on road to first bridge (Wha House) where you can turn left and follow BW along left bank of river. cross river again to Boot/Dalegarth Station and climb the BW past the Mill to Burnmoor Tarn (the BW which heads north then along the ridge is nicer, but steeper to start - see
http://www.streetmap.co.uk/map.srf?x=31 ... 02312&lm=0)
Obviously then follow BW down to Wasdale Head.
Return along lakeside road to Nether Wasdale turning onto BW which climbs SSE over into Miterdale (type 2 fun....). Once back in Eskdale, the only real option is the Ulpha Fell road.
Don't know how long this is, but it will feel a lot more than 25 miles and I'd suggest setting aside 5 hrs +
You'd have a much better ride:
From Ulpha School take the BW through Birks Wood to Far Kiln Bank. Up the steep road and at the top turn left onto BW which heads SSE above Stainton Ground to Carter Ground. Turn left at Carter Ground (through the lovely garden!) to the road and follow it NE to the BW through Broughton Moor Forest. Turn left along the road (steep descent) and into Torver. Opposite the Church House Inn (now shut

) take the lane past the campsite and follow it past Tranearth climbing hut and the quarries to the Walna scar road. Left and over the top of Walna Scar, turning left through quarries to reach the BW along the River Lickle (
http://www.streetmap.co.uk/map.srf?x=32 ... 96289&lm=0
From Stephenson Ground follow BW NW and around Caw to descend to Seathwaite (great pub here open

)
Sorry can't do the GPX thing - mail me for other ideas, detail.