The PR man shares a flat with Erica, two years his senior and fashion editor at The Sun. After 'a very long day in Paris', Erica sent the email equivalent of a cuff around the back of the head to her younger sibling: 'Can you PLEASE stop drowning the bathroom with water and wee every morning?' she pleaded, going on to ask if Gareth could pick up his own dry-cleaning.
'I don't think we've ever met,' came the response, to which Erica exploded in fury: 'I get home from a very LONG day, I have to cope with a puddle of wee, I sort out your dry cleaning and you're being silly. You can wear your sodding jeans!'
Only then did she realise the 'Gareth Davies' she had been emailing was a News of the World hack.
'She's always sending me stuff like that,' the real Gareth tells Diary.
'But I assure you I'm very hygienic.'
Whoever has to clean Edelman's gents on a regular basis will be, er, relieved.