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In two minds as there aren't alot of 68x103 bb replacement out there atm and all the BB on ebay around£50 plus...
HoKe-
DA 7410 Cartridge BB
Could try a Tange Seiki for £25?
If you have the tools, it’s a 30-60 minute job (assuming it’s doable). Put on an audiobook or podcast and save £50? No condescension intended, dunno if it comes across that way.
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Took apart a UN55 non-drive side for the heck of it (currently job hunting...), pretty easy to do if you have 2 or 3 spoke width picks, or finer.
First pic is a black plastic retainer cap that fits tight over the axle and holds down a rubber dust cap. Note the pick marks from where I pried it off; would recommend using multiple picks and a flat tool like a c Hh sim checker to gently lift it around the circumference of the axle like a tyre off a rim. Note which side goes down because if you reinstall it wrong it’ll create loads of drag.
Second and third pics are inside of the cartridge: the grey/white plastic you see is the bearing retainer, which lifts off easily exposing the bearings. You can clean them out and regrease, but they don’t come out of the BB from non drive side.
Drive side axle has a tough retaining ring, possibly steel, pressed tight onto the axle. Couldn’t pry it out but didn’t force it.
Putting it back together is easier than taking it apart, just be careful with that black cap.
Adhiero
Easier to replace, but if you’ve got the time and interest you might wanna give it a shot at servicing.
http://www.bikepro.com/products/bottom_brackets/shimda.shtml
According to that article, they were able to remove the side covers on the bearing cartridges, exposing the bearings. If you can do this, then you can service the cartridge like you would a Chris King hub. You might find once you’ve cleaned the gunk out that the bearings/races aren’t worth servicing though.