Ratter - Im told we have a few very poisonous spiders here in the uk, however, these spiders lack the fangs to deliver the venom to a human to cause much more than a bite equivalent to a wasp sting. //
Either a spider can bite you, or it can't - the delivery of venom is not governed by the strength of the spider's bite.
We have no dangerous venomous spiders native to the UK, but some come in on imported fruit and similar.
The Huntsman Spider and the False Widow Spider deliver the nastiest bites, but none are normally fatal.