Capital Allowances (Sole Trader) - 13 Month Period

theothersufyan

If a sole trader has a long period of account (13 months), with assets in both the general and special rate pool (30% private use), will the following allowances be time apportioned as follows?
- AIA = 13/12 * £1m
- WDA @ 18% * 13/12
- WDA @ 6% with 30% private use = 13/12 * 6% * 70% for business use portion?

Any clarification would be much appreciated!