Gift allowance in the UK (the amount you can give away without any danger of it affecting your inheritance tax bill each year) was introduced in 1979 at £2,000 and increased to £3,000 in 1995 but has not changed since. If it had risen in line with inflation it would now be £5,330.
Pension bonuses have suffered the same fate. In 1972 the government introduced a 25p weekly bonus to the old state pension when pensioners turned 80. It has stayed at 25p since but would be worth £2.73 today had it increased with inflation. The £10 Christmas bonus, which was introduced a year later would be worth £102.33 today.
The LTA (lifetime allowance), the maximum you can save into your pension pot while still enjoying tax relief, was introduced in 2006 at £1.5 million. If it had increased with inflation, pension savers would now be able to put away £2.24 million before incurring a tax charge. Instead the allowance has been chipped away at and today is down to £1,073,100 where it will be frozen until 2026.
Lowering the allowance has caused more savers to breach the allowance. In the year 2009-2010 tax year 890 people exceeded the LTA according to HMRC but by 2019-2020 (latest figures available) some 8,510 pension savers had breached it.