I can recommend 'How To Save Property Tax' by Carl Bayley, published by Tax Cafe (delivered online via download and also a printed book in the post), which starts by evaluating what tax status you fall into based on the kind of property activities you're engaged in, before then explaining all the allowances and deductions you may be entitled to claim and then moves on to more structured ways of minimising your tax.

There's enough information to tackle doing your own bookkeeping and accounts (I do), but even if you do end up appointing an accountant, I think it's worth understanding how the system works yourself, especially the difference between deductions you can claim now, eg repairs (revenue expenditure) versus those you can only claim when you dispose of the property, eg the 'improvement' elements of renovations (capital expenditure), because it can influence the way you start to go about things.

It's updated every time there's a new budget, but I've only bought it every couple of years, because usually not that much changes.

I believe there are other property tax guides available, but I have no experience of those.

Hope this helps.

Roberto