From the entry in Wikipedia:

“Several wrecked BV 141s were found by advancing Allied forces. One was even recovered by British forces and returned to England for examination.”

Nonme are recorded as coming to the UK. As noted above, Eric Brown managed to wangle a flight on one (as he did on a couple of other types) at an airfield in the Russian sector.

They did bring back an example of the similar-roled FW189, which he did fly in the UK