The charity TaxAid is currently looking for tax-trained volunteers to help on their busy public helpline or meet vulnerable clients face to face to resolve their tax problems in their London office. As you can imagine this can be challenging but rewarding work. Training and support is given to new volunteers - as the problems presented by TaxAid clients can sometimes be very different from the ones seen in private practice.
See www.taxaid.org.uk for more information on TaxAid and contact the office manager at Karen [at] taxaid.org.uk if you are interested.
NB. TaxAid is supported by the CIOT but is an independent charity.