Expenses claims for charity trustee meetings

I'm retired and I have joined a registered charity as a trustee director. The charity operates a museum, and I go to the museum to attend trustees' meetings; to hold meetings with stakeholders such as potential benefactors; and, from time, to time, to volunteer with duties that include cleaning, helping visitors, manning the museum's shop etc. All of this is voluntary and unpaid. In total, this amounts to (say) a journey every two weeks. Am I able to claim mileage or public transport expenses from the charity to travel between my home and the museum, without incurring a taxable benefit? The charity is willing to pay expenses but my concern is whether this is regarded as travel to/from a 'normal place of work' even though the travel is voluntary, for unpaid charity volunteering, and on an ad hoc basis.

Hi
Please have a look at Managing charity finances, which advises that expenses can be claimed from the charity.
Thank you.