It's particularly damaging at this point in time because the party is being inundated with new membership applications and they're all having to go through the call centre. How many new members are being missed because the website has been taken down is anybody's guess.
The attacks are coming from overseas which you would expect with a distributed denial of service attack but where it's coming from hasn't been made public if it's known. My guess is Bulgaria or Romania, neither of which are particularly happy with us and both have more than their fair share of organised crime gangs who will be keen to expand their empires into the UK when our borders are opened to them at the end of the year.
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