A very recent scientific paper on the new strain can be found via the below link, the conclusion reads thus:
Conclusion
We report a rapidly growing lineage in the UK associated with an unexpectedly large number of genetic changes including in the receptor-binding domain and associated with the furin cleavage site. Given (i) the experimentally-predicted and plausible phenotypic consequences of some of these mutations, (ii) their unknown effects when present in combination, and (iii) the high growth rate of B.1.1.7 in the UK, this novel lineage requires urgent laboratory characterisation and enhanced genomic surveillance worldwide.
virological.org/t/preliminary-genomic-characterisation-of-an-emergent-sars-cov-2-lineage-in-the-uk-defined-by-a-novel-set-of-spike-mutations/563
I have redd the entire paper and it is my understanding that the scientists are saying:
There has been a rapid and significant mutation of the protien spikes and that this kind of mutation is unprecedented in the history of virology
They are provisionally hypothesising that this rapid mutation may have evolved when long term, extremely unwell, immuno-compromised patients infected with multiple strains (due to the virus mutating while they were sick and infected - it mutates continually) were treated with antibody cocktails via blood plasma, thus creating an opportunity for rapid mutation via a viral vs plasma arms race that happens naturally but usually over longer periods
The mutated strain appears highly infectious and is spreading rapidly
Until they understand the clinical and epidemiological implications of the mutation we need to proceed with extreme caution and limit spread as much as possible.
They are on the case as a matter of urgency but while they do their best to understand what is going on people need to be extremely careful and stick to social distancing and other measures in a very committed manner (hope for the best but plan for the worst)
I am not a doctor or virologist just passionate about science and doing my best to understand the paper - I would welcome corrections from virologists