I have other UK bank accounts but they have maximum balance limits and once they are at or near the limit, as mine are, you cannot really do much with them.
The awkward bank either has no limit or it is high enough that it is academic. I use it mostly as a distribution point to send money elsewhere.
But you are probably right. I do need another bank that can perform a similar function and frees me, so far as possible, from these wretched OTPs.