Hi, Im no expert, but I claimed for both my pc's other the years, the 1st one cost £1300, it was before I had an accountant, I put 100% through in one year, when I got an accountant he said technically the value should been spread over the years I expect to use it.
now the percentage of the initial value would depend on business use, like if you use it 80% for business and it cost £500, you could put £400 of the value though.
I hope that helped
Scrimit