Another blasted bad IP again, in the same range as before. 146.90.**.** How long does it take to go through? And are your sure the whole block has been submitted?
I think these IP's are so old and that's the reason for this continued problem. I would like some option in my members centre please, so that I can block these annoying problem IP's until they are either removed from the pool, or the problem is sorted.
Think you need to add some fresh IP's to the pool of old dynamic IP's you have.
If these problems are so troubling to you, switch to a static IP - most modern PlusNet products permit this for a one-off £5 payment. So long as you are not in the habit of getting yourself IP bans from services you care about or bringing yourself to the attention of someone who may wish to DDoS you, this really isn't a problem unless you're in the habit of getting a fresh address to circumvent a restriction (such as the Royal Mail's per-address daily limit on postcode lookups).
With an organisation such as PlusNet, it's impossible for someone attempting to track you to know easily whether your IP address is static or dynamic without inside knowledge of the ISP. If someone is prepared to go to that sort of effort, I suggest you have bigger concerns than them examining whatever portion of your Internet traffic they have. Anyone persuading a court there are legitimate concerns about the legality of your Internet use can apply for a court order requiring disclosure of which customer the address was allocated to - dynamic IP will not protect you here.
The peril of being on dynamic IP is that you may get an address that others have got banned, or where there's some kind of geolocation issue. With static IP, any issues have to be sorted one time only, and from then on you're responsible for how other people look upon your IP address.
There are no fresh IPv4 addresses to add to pools - the supply has run out. I don't know how much spare IPv4 address space PlusNet has, but every organisation will be making strenuous efforts to reuse address space wherever possible.
An 'opt out of problem pools' switch is clearly doomed, as increasing numbers of customers will select the option and not unselect it. I'd like to know how you define a problem address, especially as recent allocations of IP blocks to organisations were increasingly likely to have come from reclaimed rather than virgin space.