Is their any legislation as regards to annual pay rises?

Question

Worked at a company for 4 years and had only 1 pay rise! 18 months ago!

Answer 1

Not in the UK, no.

Answer 2

No. With the exemptions that companies are not allowed to pay below the National Minimum wage (which rises every April)

Answer 3

Basically, there is no statutory right to a pay rise at all.

It's all down to contract/custom and practice. Contracts usually say 'your pay will be reviewed annually, but you have no automatic expectation of an increase'.  

Otherwise, if you've worked for your firm for ages, and have always had an inflationary increase, then you may be able to argue custom and practice - i.e. an 'implied' contractual term. If other people get a rise and you don't, then again, there may be issues over whether you can argue breach of trust and confidence, discrimination etc.

Have a word with your boss and see where you get to - but bear in mind that unless it is in your contract, you're not on fantastically good legal grounds.