In reply to Frankie boy:
Was in the same situation trying to find one last week. I don't think they exist in The Lakes. In places like Pembroke and The Peak there is a market for that kind of place but campsites in The Lakes are so heavily subscribed that why would they charge £3 and give you a toilet and sink when they could charge you £10 and give you a coin-operated shower too? All the campsites are heavily subscribed at the minute and people ultimately want to pay more to have the facilities and be able to drive up to their pitch.
Covid is also a massive factor. The campsites can't have people turning up late without checking in, as they are obliged to keep a list and contact details of all guests. Can't really do that if climbers are 'rocking up' and leaving when they feel like it.
If campsites make their money from booking big families, they have to make it family-friendly as a site. That means if they have a 'no noise after 10pm' rule, they can't have people turning up and pitching their tent at midnight.
We ended up getting a Premier Inn in Carlisle because we couldn't get to any campsites before their cut-off time.
The campsites are full of people paying £10pp a night on their family camping trip. They don't want your £3.