Purchasing a used minibus for commercial purposes

I am looking for advice regarding running a tour company in Ireland.

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Firstly where is the best place to source a used minibus?

I have looked on donedeal, autotrader and adverts. Can you recommend any other websites?

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Secondly what insurance cover should i have as a sole trader to run a tour company? Can you recommend any good insurance brokers who deal with a lot of companies?

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Thanks a lot for any advice.