Using last years seed.

[nick...]

ive got about 17kg of incentive osr from last year.been sealed up in lidded buckets since finished drilling last year.currently got a plate full soaking to do germination test.had one seed that had shot in hour and half with a 1mm shoot on it.would you boys drill it or buy in all new seed that may be over yeared anyway
Nick...

 

[Oat]

if the germination test shows good germination, then why not?

Is it treated?, if so, then you may find vigour affected after over a year of coating the seed, so just up the seedrate slightly.

 

[Badshot]

I'd just mix it in with the new.

 

[PSQ]

Beware. The germination may well be fine, but the vigour might be shot.
9 years ago I used some over yeared Royale with chinook dressing (IIRC) to finish a field. It germinated fine, but didn't develop past the 2 true leaf stage. It was replanted on the 23rd Sept.
The Chinook dressing was probably the cause and obviously it's not a current product.
As said, if you must, then mix it with new seed, and at least you will have a crop.

Edit: buy a new bag now and try them side by side in your veg patch, you've got a month to spot any vigour problems...