Cannondale Synapse stolen from King's Cross

My Cannondale Synapse was stolen between 9pm April 18 to noon April 19 from the staircase just outside my flat. The apartment is called Dinwiddy House, on Pentonville Road, King's Cross.
It's a black colour, size 47 Synapse. Frame number R156099. With Tiagra groupset, Truvativ triple crankset and shimano A530 single side pedal.
The rest of the spec here:
http://gb.cannondale.com/bikes/07/ce/ro ... RAS2C.html
This is how the bike looks like.

Any sightings please call me at 07770874298. Thanks very much.
Tim
It's a black colour, size 47 Synapse. Frame number R156099. With Tiagra groupset, Truvativ triple crankset and shimano A530 single side pedal.
The rest of the spec here:
http://gb.cannondale.com/bikes/07/ce/ro ... RAS2C.html
This is how the bike looks like.

Any sightings please call me at 07770874298. Thanks very much.
Tim
0
Posts
http://www.gumtree.com/london/98/41440098.html
I'm also adding a screenshot in case the ad is taken down.
http://img146.imageshack.us/img146/8192/12180677.jpg
That bike looks stolen to me because
1. there is no info about the model but the picture shows a Cannondale Synapse. I bike owner would obviously know that he owns a Cannondale Synapse and not just any Cannondale.
2. The price (240 quid) is too low for that bike.
3. There is no frame size or other detail. It looks like the person is looking for a quick buck.
There is a phone number mentioned in the ad.
Edit:
Looking at the last message I thought this was new. Now I see it was posted in April. Probably it is a different bike. But still I think that ad looks dodgy.