There were were fewer 1987 Ten Pence coins minted.
There were sufficient 20 Pence coins in circulation already. Some 1986 20 pence coins were issued as part of Royal Mint sets, but these were Proof FDC coins not for general circulation.
The Royal Mint considered that there were sufficient coins in circulation already, so no 1986 general circulation 20 Pence coin was struck. There were Proof coins and Royal Mint sets produced containing a 1986 20 Pence coin.
A British 1986 Two Pence coin (Proof FDC), could fetch up to £1 GBP. A reputable coin dealer will be able to give a more accurate valuation. These coins are still potentially in circulation so, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they are worth Two Pence.
British general circulation decimal coins, years of first issue - Half New Penny - 1971 Half Penny - 1982 1 New Penny - 1971 1 Penny - 1982 2 New Pence - 1971 2 Pence - 1982 5 New Pence - 1968 5 New Pence - 1982 10 New Pence - 1968 10 Pence - 1982 20 Pence - 1982 25 Pence (Crown) - 1972 50 New Pence - 1969 50 Pence - 1982 1 Pound - 1983 2 Pound - 1986 5 Pound (Crown) - 1990
There were no copper 20 Pence coins minted, they are all made from a copper/nickel alloy giving them a silvery appearance. If your coin is copper coloured, it is either very seriously tarnished or somebody has plated it. Modified coins have no collector value.
These coins are still potentially in circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth 20 Pence. A British 1984 cupro-nickel 20 Pence coin (heptagonal)(Elizabeth II), uncirculated and in absolute mint condition could fetch up to £0.40 GBP. A British 1984 cupro-nickel 20 Pence coin (heptagonal)(Elizabeth II)(Proof FDC), could fetch up to £1 GBP. A reputable coin dealer will be able to give a more accurate valuation.
The British 2 New Pence coin (1971-1981) is potentially still in circulation and therefore legal tender in amounts up to 20 Pence.
Piece by Piece - John Martyn album - was created in 1986-02.
What would $3.65 from 1986 be worth today?
British Shipbuilders ended in 1986.
British Biotech was created in 1986.
British Leyland ended in 1986.