I also attended Collectormania and got a pic with Tom and although things had to be kept brief due to the need to keep the queues moving I can now say I've shook his hand and he was very enthusiastic when my niece offered him a jelly baby
Prior to the photoshoot I got my first glimpse of Tom in person earlier in the day as he was being escorted round the venue by one of the event staff and there's definitely an aura about him, on TV and audio the 4th Doctor's presence leaps out at you and in person Tom is just as impressive a figure but there's no hint of an ego from him....he was great with everyone I saw him meet and my respect for him has grown even more.
They say you should never meet your heroes but Tom didn't disappoint
Me and my niece also met,
Louise Jameson = She's lovely. When I got a signed pic I managed to have a bit of a chat with her about the recent audios she's done with Tom and she mentioned that recording sessions for further ones are scheduled "into 2014" so it looks like there's a lot more to come from the 4th Doctor & Leela which is GREAT!
Brian Blessed = The first thing we heard when we entered the venue was his thunderous tones saying "TRICK OR TREAT!" as part of some anecdote and he could be heard at regular intervals no matter where we were in the venue.
When we were queueing for our photoshoot we saw several people jump when he suddenly said "GORDON'S ALIVE!" at an earth shattering volume and a few moments later a guy in a Flash Gordon t-shirt came out and said "He did it!" and punched the air!
When we got to the last few in the queue before our own picture it became apparent that everyone in Brian's vicinity was in fits of laughter as he was giving a running commentary on the entire queue and he never missed a beat between each person he met. Like Tom he made a point of making eye contact and shaking everyone's hand and anyone who met him left with a big smile on their face.
My niece also got a pic with Sean Astin as she's a fan of the LOTR movies and I ended up spending about £200 more than anticipated at the merchandise stalls.
This was the first event of this kind we'd ever been to and although things were a bit hectic because of the crowds we both had a great time and I can now say I've met my favorite Doctor & companion so mission accomplished!

"I'm not a human being........I'm a Time Lord. I walk in eternity"