I haven't done UK taxes since 2007, only my husband does. My UK income next year will be the pension which will be £3800. Not enough to pay tax. My US pensions next year (partial for SS) I estimate will be just over $6,000 with maybe $200-300 interest income.
So your total income is around 7740 pounds. Assuming you are taxed on an arising basis your US pensions, US SS, interest, and UK state pension are all UK taxable, but they are less than the personal allowance so probably no UK tax due.
Your US SS is not US taxable if you are a UK resident so you need to exclude that from your worldwide income and see if you have to file or pay US taxes.
You don't mention any dividends or capital gains, just interest. If that comes from a CD or bank account you are ok, but if you own US mutual funds you should make sure you understand the UK tax treatment of overseas funds, even if the amounts are small. Also if you own any UK funds or have UK accounts that have an aggregate value over $10k you should file FBAR.