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British 10 Pence coins were first issued in 1968 and are still being issued. There have been hundreds of millions of them minted, so they are definitely not rare.
The British decimal 2 Pence coin was first issued in 1971. Generally, they have not been around long enough to have become rare.
The smallest number ever minted in one year was the 1991 coin when...
The larger pre-1993 10 Pence coins were withdrawn from circulation and demonetised in 1993. So, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins...
The British 10 Pence coin was first issued in 1968, and general circulation coins have the following specifications - 10 Pence (from 1968 - 1992 - now demonetised) 28.5 mm diameter, weigh 11.31 grams...