I have got an autograph from EC on a couple of occasions at the Royal Albert Hall, he generally arrives for his soundcheck there at around 4.30pm, at the RAH in them days, he had to get out of his car and walk in whilst someone parked his car, now I believe there is underground parking. If there are only a couple of people there, he will generally sign.
I also got a signed photo from his office when I whinged to my girlfriend at the time that I had missed out on an autograph on another occasion, so she wrote to his management saying how hard it was to live with me, and they sent back 2 signed pics.
Dont expect to get one after the show though, EC generally leaves the building before the last note has died away.
I see your Welsh, me too, pity Andy Fairweather Low isnt still with EC, the time I got my Autograph from EC, I saw AFL arrive around lunchtime, on hearing my Welsh accent he was very helpful in telling me where and when EC would arrive.