I'm rather pleased that there has been a consistent response from the world's more civilised countries.
Hm... What I see is that UK and US politicians still think that their "gentleman" reputation is still exist, and they may sometimes, cautiously, put some BS into their arguments and it will be accepted "because representatives of such respectable country as Great Britain cannot tell BS". This UK/US reputation is heavily eroded during last half century, but, IMHO, name of a man who killed it completely is Colin Powell. Now everyone know, that "proofs" shown in UN was complete and malicious BS, and (92000 to around 500000 - there is different data sources) Iraq civilians killed for nothing (except maybe some masonic dreams) together with enormous material losses is a bit too much to just say "oops" and forget about it. There is already a lot of people who will help to remember, and there will be more and more such people, taking their notes.
This was only one "episode" of many such things that was done in a last years. So, verifiable material proofs should be on hand and ready to present, if someone from UK/US or their satellites plan to open their mouth with something serious. Here we have nearly "casus belli" event, and even if current reputation of UK govt would be similar to reputation of British Empire at the end of XIX century, in would require something more that histerical words of prime minister.
As I can see, last days media put any BS said by anyone as "silly excuses of Kremlin". It was said, that a number of countries have labs, capable to produce "Foliant" project substances - and it was immediately turned by media so that Sweden was accused in making that "Novichok" agent. Newspapers now become viewspapers, and the only two allowed forms of public racism now is northcoreaphobia and russophobia.
Russia declined ultimatum and offered to switch to a mechanism, described in a OPCW convention. It includes providing samples to a country who is suspected country of origin of agent. Britain ignored this offer. Requests for consular access to a Yulia Skripal (who is Russian citizen) also was declined. So, we have only May and Johnson words, nothing more. Not enough to start jumping (but a number of countries decide otherwise - let's see how it will be ended).
Now about oligarchs and their money. I think everyone from 70+% of russians, voted for Putin on recent elections will say "thank you" to those, who will arrest money, that is so "toxic" so it was not returned to Russia during last capital amnistion. ;) Those who after government warnings decided to left their money in a jurisdictions that value commands from Washington higher than their own laws definitely deserve loss of this money. So, if someone will have problems, it hardly may blame Putin. Been warned, but prefer to ignore.
I think British govt now need a lot of money to pay for brexit obligations. They may try to confiscate it from someone, but then one more "edge" of british "gentleman" reputation will change color from shining gold to a something brown.