Upgraded Trek Alpha 1.2 (Please see description)

Upgraded Trek Alpha 1.2 (Please see description). Condition is "Used". Dispatched with Royal Mail 2nd Class.
Selling this road bike which I bought used on Ebay back in July of this year.
Bike has a new shimano 105 rear derailleur, new chainrings, shimano 105 shifters and cassette. The seat is also quite new (Fabric line S elite medium flat saddle worth £50). Bottom bracket was replaced a few months ago as the previous one was worn out.
Seat post is carbon. Includes SKS mudguards that are detachable. Shimano RS wheels, gatorskin tyres.
Frame is 58cm and is in H2 fit, meaning a slightly more upright riding position. Rear derailleur, chain rings and chain were all added just a few months ago. Mudguards fitted 3 weeks ago by my local bike shop. The bike is fairly dirty, but nothing major.
N.B.
The bike has developed a minor fault where every so often while pedalling a thunk can be heard coming from the bottom bracket area. I've been commuting with the bike and it hasn't really affected me while cycling. You could take it to a repair shop to get it diagnosed, the bottom bracket may just need to be retightened or regreased. I checked the tightness of the crank bolts and the bottom bracket, and both were locked tight, so I don't quite know what's causing it.
That's the only problem with this bike, and it's still perfectly ok to ride. I don't want to sell a dodgy bike, so I'm putting this out there now. Feel free to take it to a repair shop before riding it if you feel unsure.
I can't accept viewings, as I'm simply too busy during the day. Similarly I don't want to do test rides, as I don't want people riding off with it.