Have the UK proved that these two worked for the GRU?
Lets assume they don't work for the GRU, they have somehow got hold of Novichok and they are acting alone. they know this is going to cause a s,,storm, they know the Russian authorities will crucify them for this attack, stolen Novichok, fallout for Russia itself.
They would do everything possible to conceal their identity.
They have flown in out direct from Moscow.
They have made no effort to conceal their identity while carrying out the attack.
They could of flown into the country without being disguised, the only time they needed to use a disguise is when carrying out the attack.
Why did they both have to go to reconnoiter Salisbury. 1 man does a quick check of the area, the other man goes alone to contaminate the door handles. both men under disguise, no connection to the 2 men who flew in from Moscow. it's the fact they have made no effort to even cover their tracks that tells us they acted on orders from the Russian State.