Sykeside is brilliant, just along from Brotherswater, so handy for Ullswater, Helvellyn, High Street etc. Great campsite and one of the few lake district ones I’ve ever had any luck with booking last minute days before a bank holiday.
Main downside (for some) no reception of any signals, so no tv, internet, mobile phone, not even radio….
TBH this close to the bank holiday I’d take anything I could get – if you try the ukcampsite.co.uk site they have an availability calendar that covers some sites but I’ve had sites come up as full on there but been able to book, so I’d ring any that grab your fancy on the off chance.
Sykeside details
http://www.sykeside.co.uk/camping.htm