CRX's comments earlier about the increased work load put on ATC are dead right!!...for the controller to be confronted with an ultralite aircraft flying through the middle of her IFR traffic as she tried to sequence it for arrival to Edinbugh is glady not a daily occurence....she did a brilliant job but then one as to be expected ...
With all due respect, the guy did have every right to be there and was under no obligation to stick rigidly to FL's, avoid IFR traffic etc. Not commenting on the actions of the controller involved who I'm sure did indeed do well, just the apparent perception amongst some here that "ultralite" aircraft should not get so high, despite the fact it was the open FIR