I'm not from the UK, but this is what I came up with on google.

11.0 mm 0.5 g Maundy Penny
12.0 mm 0.5 g Early Maundy Penny
12.0 mm 0.7 g The Penny-Halfpeny
13.0 mm 0.9 g Maundy Two Pence
14.0 mm 1.0 g Early Maundy Two Pence
16.0 mm 1.4 g Three Pence
16.0 mm 1.9 g Four Pence or Groat
17.0 mm 1.5 g Early Three Pence
18.0 mm 1.9 g Maundy Four Pence
18.0 mm 3.3 g Decimal Five Pence
19.0 mm 2.0 g Early Maundy Four Pence
19.0 mm 2.8 g Sixpence
21.0 mm 3.0 g Early Sixpence
21.4 mm 5.0 g Decimal Twenty Pence
24.0 mm 5.7 g Shilling
24.0 mm 5.7 g Decimal Five Pence (large)
24.5 mm 6.5 g Decimal Five Pence (small)
25.5 mm 6.0 g Early Shilling
27.0 mm 7.4 g 18 pence
27.3 mm 8.0 g Decimal Fifty Pence (small)
28.0 mm 11.3 g 1849 Godless Florin
28.5 mm 11.3 g The Florin or Two Shillings
28.5 mm 11.3 g Decimal Two Pence (large)
29.5 mm 11.3 g Jubilee Florin
30.0 mm 11.3 g Gothic Florin
30.0 mm 13.5 g Decimal Fifty Pence (large)
32.0 mm 14.1 g Half Crown
34.0 mm 15.0 g Early Half Crown
35.0 mm 15.0 g Three Shillings
36.0 mm 22.6 g Four Shillings
39.0 mm 28.3 g Five Shillings or Crown (date before 1970)
39.0 mm 28.3 g Decimal 25 pence
39.0 mm 28.3 g Decimal 5 pounds
39.0 mm 30.0 g Early five shillings (or Crown)

__________________
I have to go pee
feel it pressing on bladder
like a stream, relief