Priorities...

I don't really know what you are up to, so it's hard to voice an opinion. But if you must have those Tannoys and have to sell your Gamut to be able to make it happen, then I would say that you will be looking at the entire preamp-amp-speakers upgrade, just not all at once. In the meantime you will need some amplification before you can afford preamp/amp to bring out the best out of the new speakers. If that's what your plans are, I might suggest selling both Gamut and Pass, get those speakers and some good integrated until your can afford separates. How about YBA Integre Passion, I saw it on sale here? It's an excellent integrated, 100 watt/ch, has XLR and RCA inputs and preamp out. Could this be an acceptable sound until better times? Or you don't expect to be able to upgrade the equipment for a long time and just want to replace the power amp with something decent?
Frankly, I have no idea how Pass works with Gamut and how Gamut works with Tannoy, maybe your speakers are fine but the signal they get is not good enough, I don't know.
My own approach is if I really like the speakers, I upgrade electronics until time comes when speakers reach their limit. In this context I upgrade speakers last. Perhaps all you need is to upgrade your Pass preamp, at least for the time being. Or cables. Or both. Again, hard to figure it out without knowing what you wish to accomplish.

Who ever said people are logical? 
Well then just sell the Gamut and get some inexpensive Pass amp. Those Tannoys don't need much power, as I understand.

I could respond to the last post with the following thought - we only live today, especially so after a certain age.
However, I do have an impression that the OP may not want those speakers badly enough to go into complicated and potentially costly maneuvering.
That's the point of any discussion to have different opinions that all have the right to be, not some nonsense presented as an opinion and demanding the acknowledgement as such.
Objectively, I believe there is no one 'right thing to do' here. Subjectively, that's what the OP will have to figure out for himself.

I agree with everyone. There are excellent integrated amps that can be a great compromise. There can also be different approaches to funds management, they all have a right to be. The key point is keeping things under control, sometimes difficult when you use easy credit.
Normally I too don't buy any equipment unless I have funds, but I can imagine a situation when I could go into some debt to get what I just must have.
Not an easy choice for the OP, yeah.

This brings us to another question. Assuming the same quality, is more power always better if the speakers can handle it and won't blow up ?

Come on guys, our goal is to indirectly participate in the OP's sound quests not to work something out for ourselves.

The question to him was 'stupid' and provocative, he had little choice. He could've said - recording - , though. He also could've said that the question was not correct, that separation of elements would be artificial. Legacy speakers, good stuff but not great, right?