Have had experiences in past with ATOS/DWP/tribunals and expect to have to deal with them again in next few months.
Good move having a home visit, much better than going to them.
I have posted some comments about ATOS already here: http://www.tpuc.org/forum/viewtopic.php?f=60&t=36418
and here http://www.tpuc.org/forum/viewtopic.php?f=60&t=36418
. 2nd topic has some useful links for more research.
My strategy for the medical is stay in honour but put them in a situation where they may not wish to conduct examination. Also, to capture as much evidence to use against them if a tribunal is needed. To do this, I suggest:
1. Record the examination and have a witness taking lots of notes (preferably someone who can do shorthand, or fake it) don't ever disclose the recording but create an accurate verbatim report of every word.
2. Get everything prepared - have all your papers to hand. I made the mistake of having to walk 3 steps across the room to get a document and it was used as assessment of my walking ability. Have a copy of your questionnaire open in front of you so you can read the information back to them.
3. Get full info about "doctor": name, contact details,qualifications,experience,membership ref for professional bodies etc. Best option I can think of for this is give them a form to fill in with a declaration to sign.
4. They normally need you to sign a consent form - do it "under duress" and have ATOS letter to confirm threat to stop benefits.
5. Take plenty of time with everything - they have a set time for each visit.
6. If they try closed questions (yes or no answers only) ask them to explain the question more, or just ignore them and answer the question with a detailed statement of what you want to say. If they insist you only answer yes or no, then answer all subsequent questions "yes or no".
Hope some of this gives you some ideas how to get through this. I haven't had chance to test all this out so if you can give us some feedback afterwards I would really appreciate it.
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