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https://www.gov.uk/getting-an-mot/retests
https://www.gov.uk/government/publications/motorcycle-mot-inspection-checklist-vt-29mI used to take mine to a place that only did MOT tests and not repairs - they were known classic / vintage enthusiasts and sympathetic to the idiosyncrasies of autocycles and clip on engines, and the question of who should do the work didn't arise.
This was rural Shropshire before the days of V112 - there must be somewhere equivalent in London?
http://www.moneysavingexpert.com/travel/cheap-mot
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You have a month before the MOT expires to get it tested without affecting the expiry date - your new MOT will last twelve months from the exits of the old one so next year get it tested as soon as possible and you have a month to fix it and still be legal to ride it - unless the fault is dangerous of course...
Some will charge you a lower fee to retest and some won't.
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No doesn't matter but go for a recommendation of MOT stations.
Yes you have a certain amount of time to repair and return for a free retest confirm with the MOT place. Most won't mind at all. Yes the bike is legal to ride beware if it is deemed unsafe they won't let you ride away.This is the MOT checklist https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/449526/mot-inspection-checklist-motorcycle-vt29m.pdf to give you an idea what is looked at.
My MoT is expiring soon, on the first bike I've ever owned. Does it matter where I take it? And when I'm presented with a list of what it's failed on, can I take it home and repair them all before bringing it back? Is it legal to ride at that point? And will the garage mind that I'm not getting them to do the work? In fact, is there a list of checks that I can follow to attempt repairs before? There are some niggles, but I don't know what it can fail on.