When asked for financial evidence by immigration officers at the passport control when entering UK, can I submit the bank statements of the bank at my home country?
GOV.UK (see p.2) does not make it an absolute requirement to have such paperwork with you when seeking entry, but in general it can be a good idea to have available the same documents when seeking entry as were supplied with your visa application. This advice is stated outright if you use the wizard at Check if you need a UK visa.
Bank statements do NOT have to be from a UK bank, or in Sterling. Most foreign national visitors would not have, or be able to open, UK bank accounts anyway.