I haven't used an accountant. I just do it myself. But I do get emails on AW from accountants who assume we don't pay tax lol. Am tempted to use one of them.
I have been self-employed in another area of work for the last seven or so years so am pretty used to submitting my own online tax returns and am pretty happy paying the amount of tax I usually need to, though haven't made claims for a work place in the past as worked in a driving related occupation.
As I understand from reading through some of the past posts on here I can claim for a proportion of rent and rates based on the space used and amount of time in use for work, which sounds reasonable enough given that someone else may be claiming for an entire work flat at a much higher price. Do you claim anything for the place you work from?
I think the rest of it is pretty clear on what would be reasonable deductible expenses for the job.