The ten-year gilt yield was at 5.29 per cent this week after spiking through Tuesday and Wednesday, the fastest move among G7 sovereigns, according to The Independent. Seven days earlier the Bank of England had held Bank Rate at 3.75 per cent, with three of the nine Monetary Policy Committee members voting for 4 per cent instead. Neither number is the one that sets what a UK household pays on a two-year fix. That comes off the sterling swap curve, and Nationwide has repriced twice this month to keep pace with it — the second round lifting fixed rates by as much as 0.30 percentage points across its first-time buyer, home mover, remortgage, switcher and additional borrowing ranges.
The chain from gilt yield to your mortgage offer
A fixed-rate mortgage is not priced off Bank Rate. The lender hedges the deal with an interest rate swap, and the price of that swap tracks gilt yields, because both are priced off the same expectation of where rates will sit over the next two, three or five years. The Bank's own September minutes describe "full and fast pass-through from increases in short-term overnight index swap rates to key lending rates faced by UK households and businesses", and then put a number on it: the quoted rate on two-year fixed-rate mortgages was around 95 basis points higher than before the Middle East conflict began. CPI inflation rose to 3.1 per cent in August and the Bank expects it to climb further over coming quarters.
The gilt side of the chain has its own supply story. At the same meeting the MPC voted unanimously to run its government bond holdings down to zero, at an average pace of £46bn a year to 2034, through £20bn of sales a year alongside maturing gilts. That is issuance the market has to absorb while the Debt Management Office is also funding the deficit.
What Nationwide actually changed
Nationwide moved in two rounds. The first lifted fixed and tracker rates by up to 0.2 percentage points across first-time buyer, home mover, existing customers moving home, remortgage, switcher and additional borrowing products — the full residential range, at a lender that holds a large share of UK mortgage accounts. The second, effective 15 September, pushed fixed rates up by as much as 30 basis points, taking first-time buyer rates into a band of 4.64 to 5.74 per cent and leaving remortgage rates close to 6 per cent, according to Mortgage Solutions.
It was not an isolated move. Santander raised selected rates by 45 basis points, HSBC repriced two and five-year fixes and trackers across every loan-to-value band, and Halifax, Barclays and TSB all moved in the same fortnight. Bank Rate did not change at all in that period.
"When a lender the size of Nationwide moves rates up, the rest of the market pays attention. This is not a surprise given where swap rates and gilt yields have been heading, but it is another blow for borrowers who were hoping the worst was behind them."
— Jamie Alexander, mortgage director, Alexander Southwell Mortgages
What it costs in pounds
Moneyfactscompare's snapshot on 24 September put the average two-year fixed rate at 5.92 per cent and the average five-year at 5.94 per cent. The cheapest widely available two-year fix was 4.75 per cent from Barclays Mortgage at 60 per cent loan-to-value with an £899 fee; the cheapest five-year was 4.74 per cent from first direct at the same LTV with a £490 fee, reverting to 6.24 per cent when the fixed period ends.
The arithmetic matters more than the headline. On a £250,000 repayment mortgage over 25 years, 4.75 per cent costs about £1,425 a month. At the 5.92 per cent average the same loan costs about £1,599 — roughly £173 a month, or just over £2,000 a year, for the same house and the same term. A borrower landing on that 6.24 per cent revert rate pays about £1,648 a month, around £224 more than the cheapest five-year deal on the market this week, which is the trap for anyone who lets a fix lapse rather than arranging a product transfer early.
The tracker option is cheaper today and riskier tomorrow. The average two-year tracker rate is 4.52 per cent, about £206 a month below the average fix on that same £250,000 loan, but it moves with Bank Rate, and three MPC members are already voting to raise it. FCA figures show more than 880,000 borrowers renewed up to six months early in the first half of 2026 under the mortgage charter, and a similar number have deals expiring before the end of the year.
What to watch next
Two dates dominate. The Budget on 28 October is where gilt investors will judge whether the fiscal arithmetic holds; The Independent reports that rising yields are eroding the Chancellor's headroom and raising the odds of tax rises. The next Bank Rate decision is 5 November, with markets pricing the possibility of a move rather than a cut.
For anyone with a fix ending in the next six months, the practical question is not what the Bank does but what the swap curve does, and it is moving against them. The gilt market reprices in hours; a lender's rate sheet follows within days. The window on today's best rate does not stay open for long.