The obvious one would be the Wasdale Head campsite. offering the shortest route onto Scafell Pike. It has showers, a shop and a cracking pub close by.
There is also basic camping at Seatoller and Seathwaite in Borrowdale,These are handy if you want to tackle Scafell Pike by Styhead Tarn and the corridor route being around 12 mile long can be a very long day.
Mark