Baph

If it were my bike (or a friends bike more accurately, as the servicing is done myself on mine), I'd just re-do the brakes & re-adjust the throttle freeplay.

Take all of 20mins. Throttle freeplay is a subjective thing anyway, different spanner monkey's set it differently, and different riders like it differently, so that's not a real issue to complain about - so long as it's within tolerance.

The brakes, if you're concerned, take it back to them to check it over. The front afterall does most of the work.

As for the surging at low RPMs, it's a curvy (as they balanced carbs not TB's), so I dunno. If it was a pointy, I'd say check the TPS adjustment, but I don't know if curvy's have TPS'.