Sorry if this question has been asked to death but do I need the (very expensive) Tacx Ant+ dongle or can i just use any old one off ebay with an extension lead so it sits nice and close to the trainer?
It does not matter which ANT+ dongle or USB extension you use.
I have been using these for years without issue:
https://www.amazon.com/gp/product/B00NH11PEY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B01MXXDBNK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
This is also an option: ANT+ Bundle - Zwift
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Thanks buddy. 
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