Save unified diff.

We would like to be able to get a diff between two files in the repo
browser and save this to a file.

From what I have seen this is only possible on a full directory basis ("mark
for comparison" one dir then "show differences as unified diff").

We then have to awkwardly copy/paste to a new file rather than being able
to save the output.

TortoiseMerge allows us to *see* the unified diff but not save it (or
copy/paste it).

I am using TortoiseSVN 1.5.6 with a 1.4 server (for now).

Is there a way to get what I want that I have overlooked?

-- 
// Andrew MacKenzie  |  http://www.edespot.com
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// Wrinkles should merely indicate where smiles have been.
//                 -- Mark Twain