We certainly have had increase in tax over time and it never seems to get much less under either party, sadly.
This is quite interesting:
"In 1900 public revenue in the United Kingdom was 10 percent of GDP. Now it is 37 percent GDP after peaking at 43 percent GDP in the early 1980s.
Chart 3.21: Public Revenue 1900-2017 www.ukpublicrevenue.co.uk/past_revenue
Public Revenue in the 20th century ratcheted upwards in two great steps to finance the great exertions of the world wars.
Prior to World War I, public revenue sat at about 11 percent of GDP. Then, after peaking at 33 percent in 1921 it settled back to about 22-25 percent of GDP, and remained at about that level, except for a surge at the start of the depression in the 1930s. In World War II public revenue surged to 37 percent of GDP in 1945.
After World War II, public revenue consumed about 37 percent of GDP, and rose to a peak of 40 percent of GDP in 1950 before declining to 33 percent by the end of the 1950s."
See also theconversation.com/fact-check-have-the-conservatives-always-been-the-low-tax-party-77742
Generally the British people are quite sensible about which party they elect. i don't think Labour has much chance in the next election but we shall see.
In the 1960s revenue climbed steadily, reaching nearly 41 percent of GDP by 1970. In the 1970s revenue declined to 33 percent by 1973, and then fluctuated between 35 and 39 percent of GDP.
In the early 1980s public revenue surged to over 43 percent of GDP in 1982-83. Then it began a steady decline bottoming out just below 35 percent of GDP in 1994.
After 1994 public revenues increased up to 37 percent GDP in 1999, and exceeded 39 percent GDP in 2008. In the 2010s public revenues have jogged along at about 36 to 37 percent GDP. "