Hi Pete, you have been asking the wrong person(s), by the sound of it. I have been the Wardens' Sec for the DYO CAC for the last few years and don't recall a request from you! PM me (or DudleyBug) your details and between us we will ask those who hold Warden permits for someone to step up.
Please give some alternative dates if possible, and you stand a MUCH better chance during the summer months, because in winter you have to be very lucky for your chosen weekend to coincide with suitable weather. DYO is extremely weather-dependent.
As with most other caves where you need a Warden or leader, there are a few who do more than their share and and rather more who rarely if ever offer to lead trips. If you are a DYO Warden please read the plaintive tone of Pete's post and ask when you last led a trip...