My immediate thoughts on this are that you can use ‘normal’ UE prior to cpaital reaching £17k and then diminishing capital at this point 8)
If clmt’s IS ended solely due to capital, their UE between Dec 02 and Feb 03 will be ‘full’ HB.
From Feb 03, there is a genuine period of nil ent but as this is due to cap over £16k, diminshing capital rules apply. Once the diminshed/calculated capital figure is under £16k, the UE will again be ‘full’ HB.
This would be messier if other issues affected IS as well, but from your post this is entirely capital &, as the tariff income is not going to exceed app amounts, the only bit of the o/p not cleared will be from Feb 03 until the diminished capital rules reduce to under £16k.