I went through Romania in my trip to Istanbul and back last September.
Apart from Romania itself, the highlights on the way out and back were Black Forest in Germany, Croatian coastal road (and Balkans region overall). I'm not sure if the best way to get to Bulgaria from Croatia is via Montenegro-Serbia or Montenegro-Albania-Macedonia, perhaps others can advise. I didn't like Albania, especially the northern part I would avoid if given an option.
In Bulgaria be sure to drop by to Motocamp, makes a nice stop before taking a ferry (barge) across Danube to Romania.
As others have said, the whole southern part of Romania is empty, the roads are good though.
On the way back, I would really spend few days in Austria, do the Grossglockner pass and just ride around taking smaller roads in the mountains, it was an unexpected highlight. Hungary was horribly boring I can second that.
Note that being from the UK you'll most likely have to buy local insurance outside of EU (Montenegro, Serbia, Albania, Macedonia), and reports are in some of those countries it can be quite expensive (e.g. Macedonia 50 EUR minimum).
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