Doesn't look like the DE signature as they had mirror scratchplates, but you'll easily know for sure by the signature on the headstock.
Even if it's not a DE these are excellent basses, £99 is a bargain.
Down II is one if THE bass albums. An absolute planets-in-alignment perfect storm.
Sadly the bass is pretty nonexistent on the first album. There was talk of Rex rerecording the bass parts for a reissue around the time of II but it never came to be.