Hi Shameera
Are you a Sri Lankan national? Do you have a valid work visa to work in the UK?
Without meaning to sound negative, I think you might struggle to get a Visa for the occupation you are seeking, at least without some kind of sponsorship, as there are already too many bookkeepers for the jobs available, plus, as far as I'm aware your qualification is not one from a recognised Accounting/bookkeeping body. (Needs checking).
Do you have contacts here?
The other post you have made comment on is almost 12 months out of date so I would be surprised if it is still available. Certainly the original poster has nev been back on since July 2018, but 10/10 for trying - you never know.
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Joanne
Winner of Bookkeeper of the Year 2015, 2016 & 2017
Thoughts are my own/not to be regarded as official advice,which should be sought from a suitably qualified Accountant.
You should check out answers with reference to the legal position