Darren's surname seems likely to be Izzard. I can see why it's a bugger to anagram. Penelope's is trickier- all those consonants. I'm going to go for 'Whittern', as the most likely of an unlikely bunch of alternatives ('Penelope Threwtin', anyone?) Graham is indeed, I think, using a middle name. After a long blind alley in which I was convinced his surname was either Butler, I'm now going with 'Graham Paul Roberts' If Rosie is indeed named Hugh, his surname might be 'Stroude'. But from Dr Q's comment, I suspect s/he isn't. Maybe by 'sorta', Dr Q was hinting that the surname is Hugh, or more likely Hughes. But that leaves a pretty odd bunch of letters to make a first name out of- is there such a first name as 'Tudor'? Finally, I don't think Chalky's name is Kathryn, since we have the additional clue that spelt backwards it looks Russian. I therefore suggest she is that well-known Muscovite 'Yhtak Tropnevad', otherwise known as Kathy Davenport.
Jonathan Ellis? Hmmm... how about 'Jeans Hit Noll', 'Ah Jell in Snot', 'Halt Sloe Jinn', 'All Hens Joint'or even 'Anal Hens I Jolt'? I could go on, but I won't - I'll just point you here.
Well, Prof, it's not that hard to deduce my name as I already gave it away in Orange some time ago!!! My anagram software of choice is Anagram Genius which is absolutely superb. They also make Crossword Maestro which solves cryptic crossword clues. (And no, I didn't use it to solve Wol's, in case you're wondering!)
[Darren] I'm flattered you thought it might be necessary! Oh, and if anyone's interested, I'm ADDIIIKLLNVW. But there's a clue somewhere in the archives.