Not agreeing with Boris Johnson does not make Corbyn a conspiracy theorist.

This Blog  and Rodolfo Walsh's Glasses  have pointed out t what the latter refers to as the "the worrying number of people who seem determined to ignore all the evidence and identify over he attempted murder by poisoning of two people in Salisbury another culprit, however bizarre or tangential their choice of 'culprits' is".
 Not agreeing with Boris Johnson does not make Corbyn a conspiracy theorist.
The main problem with these "conspiracy theories"  that it discredits , those who whilst acknowledge that Russia and indeed President Putin are main suspects  believe  the Alice in Wonderland   position of the government  of Verdict First Evidence Second should not be the immediate response.

The website Political Betting reproduced  a Foreign Office  video which mocks what it calls Russia's  campaign of disinformation, but it clearly is also aimed at those who do not automatically follow Mrs May's and Boris Johnson's line.

Foreign Office 🇬🇧‏Verified account @foreignoffice

The nerve agent came from Sweden, Ukraine did it to frame Russia, It was contamination from the UK's own research facility... Instead of providing an explanation for the Salisbury incident, Russia has launched a campaign of disinformation

97.7K views

0:21 / 1:03

You can see it here.

 Indeed it seems that Political Betting  has fallen for this they say.

What say you Mr. Corbyn?

The above video which has been issued by the Foreign Office looks appears to be a very different approach to diplomacy in relation to Russia than we have seen before.
Clearly in the current situation where this is all about winning the battle for hearts and minds and who do you believe getting your case out there is highly important.
Having looked at the video a couple of time I think it’s quite impressive. It is simple a straightforward and uses the graphics very well – it certainly won’t be out of place on social media. It is, perhaps, a shock that the Foreign Office should be acting in this way. You normally expect them to be working behind closed doors not going public in a big way,
There is the ongoing situation that the leader of the opposition and member of the Privy Council, Jeremy Corbyn, seems to be going out of his way not to criticise Moscow in any way.

Mike Smithson

I am not a Corbynist  but I see nothing wrong in his stance over the Salisbury attempted murder .

As far as I know he has not put forward any of the conspiracy theories above and it seems that the FO and Boris Johnson are not so much interested in discrediting Russian disinformation or conspiracy theorist, but those like Jeremy Corbyn who has called for more evidence before pronouncing a verdict.