From the car park at Patterdale (£2 for a day - better than the £5.50 in Glenridding!), up behind the hotel & through Glenamara Park. Over Hag Beck & to the foot of Thornthwaite Crag. A steep climb to a stile over the wall and then a good path around the northern flank of Birks (if you need to bag it, a short walk back on yourself to the featureless summit & return will only take about 15 mins). St Sunday crag now opens out in front of you.
St Sunday Crag via Gavel Pike

Around the base of the mountain across Gavel Moss (boggy) and up a short gully to the base of Gavel Pike. A good stomp up the ridge (no difficulty) & over the Pike itself and a gentle walk to the top & summit. Along narrowing ridge towards Fairfield and the base of Cofa Pike.
Cofa Pike & Fairfield

Cofa Pike is not as difficult as it looks from the base. A couple of easy routes open up as you start to climb & you tend to zig-zag up through the rocks to the top. A narrow ridge leads onto the Northeast flank of Fairfield (great fun in deep powder snow!) and thence to the summit.

Descend via the steep screes towards Seat Sandal & down to Grisedale Tarn & the path back to Patterdale. 11 miles, 6 hours & 2900' of climb.