There are really not poison rules. Poisons are handled like most other damage, see Levels of Injury (page 85). Essentially set a difficulty to resist it, determine the damage, and the attributes to resist it. You can tailor the poison damage depending on what you want it to do. For instance, A mild knockout gas may difficulty 12, damage S/S/S, resist with Strength + Resolve+die roll. A Dangerous hallucinogenic might be difficulty 21, damage 4/8/L, resist with Awareness + Ingenuity + die rolll. Other effects such as duration or side effects can be part of the damage effect as needed for the poison you are trying to model. Poisons can be modeled in other ways such as for Silurians (page 157). Hope this helps.
Does the main sourcebook have rules for poison anywhere???
Poison rules are standard rules in any basic corebook of any system and they appear to have been overlooked in this case.
Basic poison rules are given on page 74 of the First Doctor Sourcebook but more in-depth rules are in The Rocket Age game (page 216), which uses the same Vortex Game system as Doctor Who.
In accordance with forum rules, here is an excerpt from the official Vortex game rules for poison, first published in Rocket Age. There are only two examples of poisons listed in this example but in the game there are many more. It's also worth mentioning that Rocket Age also expands the Vortex game system rules in a few areas that are useful for Doctor Who and is worth a look - not to mention, both games are 100% compatible with each other and either can be mined for content.
In accordance with forum rules, here is an excerpt from the official Vortex game rules for poison, first published in Rocket Age.
I don't think that's how "official rules" work. That's how poison was done in Rocket Age; that doesn't mean you "officially" do the same thing in Doctor Who. I haven't read or played Rocket Age, I don't plan to, and I do not accept the notion that I'm lacking "official rules" for playing Doctor Who.
Skudge001 has it exactly right. Choose a difficulty, choose attributes and skills to roll against, choose damage levels, and choose what attribute is damaged or what effect you suffer. Doctor Who doesn't need a poison role because its general attack/damage rules already cover it.
doctorrules, here are the 'official' basic rules for poison on page 74 of The First Doctor Sourcebook. Enjoy
Poison In Doctor Who: Adventures in Time and Space, a character who gets poisoned must make a Strength + Resolve roll to resist the poison’s effects. The Difficulty of this roll depends on the potency of the poison. If the roll succeeds, then the character may still be affected by the poison (suffering damage of some sort) but avoids being killed.