Technically (and legally) no, unless you're putting them on a car which could have had them originally - i.e. was registered before 1/1/1973 (don't think that's changed in line with the tax changes).
You're unlikely, judging by the number around, to have any problems, however. That said, sods law would dictate that you'd immediately get pulled and fined the moment you put them on.
are you sure they are legal? cant find much info on if they are or arent. Look better than stock though!
Please Note:
We require proof that the number plate you are ordering belongs to you.
We need to see the V5 Registration document that relates to the plate or V948 from the DVLA for proof of purchase
NO plates will be 'made up' until this proof is sent to us. No exceptions.
Sorry for any inconvenience but this is a legal requirement by law.
ALL of our road legal number plates will have our supplier name in the middle at the bottom of the plate and also the British Standard number is the lower right corner. This will be in a light grey colour.
If they're not made of (or covered in a) retroreflective material (i.e. they're just plain, matt or painted) then they're not legal for used on a modern car.
*Apologies for the edit, was trying to phrase it in the correct fashion*
As far as I know they're legal (and they're equally as reflective as normal plates, as they're identical material except the lettering) I got them from the below site who assured me they are legal.
http://www.dmb.uk.com/cat/30/road-legal-number-plates
See quote from website below. They DO make illegally spaced plates etc, but on those ones they miss out there postcode etc so they're not responsible for any issues... My gel plates I've had from them have all the correct details, postcode etc so they wouldn't risk it putting the info on the plates if they weren't legal ones as I believe (not 100% sure) that they can lose their status/licence as registered plate makers?
I get mine from there tooGreat quality plates.