I honestly think that this is one of the worst ideas ever.
The dual carriageway gets clogged up on many occasions as it is whilst pushing the jam back down to the Robin Hood gyratory. This is just going to make it worse.
Also why is there a an ability to turn left into Fleming Rd going southbound. Surely the traffic that wants to enter the estate will have a better route by going down the A4 and turning into Faraday Rd?