Alaric wrote:Itsallaguess wrote:Ignoring, for now, the FSCS protection limit, I still think I prefer to have my invested capital spread across more than a single broker purely from a no-access risk-mitigation point of view.
That view makes sense, but where would you set the limits as to the maximum with a single Broker and the maximum number of accounts you were prepared to manage?
For any risk (and in particular either total-loss risk or no-access risk), I wouldn't think of it quite that way. I would instead set a percentage of my whole portfolio that I was prepared to lose to the risk in the hopefully very unlikely event that it materialised, and look at the consequences. E.g. if I decided on 30% as that maximum percentage (and assuming that I'm not significantly worried about it materialising before the FSCS limit goes up in April), then I'd apply the following limits for a portfolio evenly split across N independent providers:
* For total-loss risk, I might lose 1/Nth of my portfolio, but get back £85k in compensation. So for a portfolio value of P, I might lose P/N - £85k, and I want that to be at most 0.3P. Solving that, it works out that I need P <= £85k/(1/N - 0.3) provided 1/N - 0.3 is positive (if it's negative, that means that P/N is always less than the maximum loss I'm prepared to take, i.e. that N providers will do regardless of the portfolio size). That means that a single provider will do me fine up to a portfolio value of £85k/0.7 = £121k, two providers will do me fine up to a portfolio value of £85k/0.2 = £425k, three providers will do me fine up to a portfolio value of £85k/0.03 = £2.833m; and four providers will do me fine for any portfolio value at all.
* For no-access risk, I might lose access to 1/Nth of my portfolio - and while I might well get access to £85k of the loss back from FSCS compensation eventually, I wouldn't count on it being quick enough to avoid the no-access issue! (Yes, I know it's
supposed to be quite quick - but reality doesn't always match theory on such things, especially if a provider collapsing put the FSCS under real strain...). So that says that P/N ought to be at most 0.3P regardless of the portfolio value, and thus that I want four accounts regardless - or to be more accurate, depending only on whether I regard a loss of access to the portfolio as an issue that needs to be solved quickly. That probably only happens once I'm relying on the portfolio's income (which might or might not happen at all, since it is possible that a HYPer is only using their HYP for 'icing on the cake' income and so never be
relying on it at all). So it's probably not going to matter to me until the portfolio is quite large.
In practice, of course, the portfolio is highly likely not to be split entirely evenly across different providers (except if N=1, when it's automatic), which means that somewhat lower limits are probably appropriate. But it is possible to manage that split by choosing where to put new investment before one starts drawing income from the HYP, and indeed afterwards by choosing which accounts to draw income from provided one doesn't draw all the income from it, but instead retains some of it as 'safety margin' within the HYP.
I should emphasise that I'm not saying HYPers should regard a 30% loss to these very unlikely risks as acceptable - about all I feel I can say about that is the obvious point that they should regard it as considerably more acceptable / less unacceptable than a 100% loss, and anything beyond that is basically up to the individual HYPer. My point is just to illustrate how I would go about answering your second question once I'd decided about that, and why I don't really regard your first question as having an answer: in the total-loss risk calculation I've done above, I want to move up from one provider to two at £121k, from two to three at £425k/2 = £213k per account, from three to four at £2.833m/3 = £943k per account, and never from four to five...
Gengulphus