Just came back from my LBS with the bike wearing the same B/B which was quite loose on the NDS which has the plastic cup and didn't seem to have any play (unfortunately the company I ordered the UN55 screwed up with the order and I had to re-order it). The B/B shell was (as expected for it's age) clean and except for a wipe down didn't need anything done to it. One thing that did change was the chain-guard and chain-guard bracket which was held on by the B/B which where removed. Surprisingly even without the chain-guide bracket's extra width, the front derailleur didn't need any adjusting and the gears worked smoothly.
The trip from my LBS to home is less than a mile so it's too soon to tell if everything's okay, but the UN55 will eventually arrive and will be swapped with the existing B/B soon after.