If you are giving your driving, the attention it deserves, then there are no blind spots - you are aware of every other vehicle around you, and keep close tabs on them.
On a slip-on road, you use mirrors, combined with the over the shoulder glance, to make sure there is nothing there. Likewise, when passing a slip, even though you have right of way, you make sure there isn't a vehicle alongside you, who may not be aware of your presence.
The one blind spot to be really wary of, on all vehicles, is behind the A pillar, especially when approaching a roundabout. If a small vehicle, already on the roundabout, is moving at a perfect speed to match the apparent movement of your A piller, that vehicle cannot be seen at all, if you keep your head still. Always, when approaching a roundabout, I make a point of moving my head position forward, to look and see what the pillar might be hiding. The A pillar, can be quite wide on modern vehicles, and one on my car is especially wide.