I'm not a very demanding guest, and no stranger to budget hotels, but this was an unpleasant experience. The room was damp, dirty and small. The shower (in a tiny, disgusting bathroom) could not be used by our kids, as it went from lukewarm to scolding hot in a second.
The hotel aircondition went on and off randomly and was so noisy that it made it hard to sleep (as did the stomping guests upstairs). Two of us woke up with what was probably bed bug bites. In general, all parts of the hotel - from furniture and carpets to windows and walls - were worn, torn and dirty. The reception staff appeared indifferent to pretty much everything.
Having been to GB several times, and stayed in budget hotels, we knew what (not) to expect from breakfast. However, this was below any standard. We chose to have breakfast at Victoria station instead.
To sum it up: the Blair Victoria is *not* recommended!