I have a spelling checker
It came with my pea sea
It plane lee marks four my revue
Miss steaks eye can knot sea

Eye ran this poem threw it
Yawl be glad two no
It’s vary polished in its weigh
My checker tolled me sew

A checker is a bless sing
It freeze yew lodes of thyme
It helps me right awl stiles two reed
And aides me when aye rime

Each frays come posed up on my screen
Eye trussed to bee a joule
The checker poured ewer every word
To cheque sum spelling rule

Be fore a veiling checkers
Hour spelling mite decline
And if were lacks or have it laps
We wood be maid to wine

Butt now bee cause my spelling
Is checked with such grate flare
There are know faults with in my cite
Of none eye am a wear

Now spelling does knot phase me
It does knot bring a tier
My pay purrs awl due glad den
With rapt words fare as hear

To rite with care is quite a feet
Of which won should be proud
And wee mussed dew the best wee can
Sew floors are knot aloud

Sew ewe can sea why eye dew prays
Such soft ware for pea seas
And why eye brake in two averse
By righting wants to pleas

It's rough and it's tough, although it's even tougher if you come from Slough!!! 

If anyone's in any doubt, 'uff', 'uff', 'oh', 'uff' and 'ow'!!!

Explain me the Tire/Tyre Color/Colour Flavor/Flavour instances?? There seems to be many more words with subtle differences like that used in different places.

Of course it's a much older dialect, with far more connections to other languages, cultures and historical contexts.

Quote

Of course it's a much older dialect, with far more connections to other languages, cultures and historical contexts.

Actually, in many cases it's 'American' English that is the older dialect. There are many American spellings that have not changed since the 18th century. It's the British versions that have changed.

A recent example is the common use of 's' instead of 'z' in modern British writing. 50 years ago, all words that end in 'ise' were spelt with 'ize'. Nowadays, the Oxford English dictionary lists both as being correct but you rarely see people using the 'ize' form in Britain. In the US, it's still spelt as it always has been.

  For example, the word "schedule" is pronounced shedule 

If we British people say shedule instead of schedule, why do we say school instead of shool.  Anyone know why???

There are some other examples, but I can't think of them now!

school - "place of instruction," O.E. scol, from L. schola, from Gk. skhole "school, lecture, discussion, leisure," originally "a holding back, a keeping clear," from skhein "to get" + -ole by analogy with bole "a throw," stole "outfit," etc. The original notion is "leisure," which passed to "otiose discussion," then "place for such." Replaced O.E. larhus "lore house." Sense of "people united by a general similarity of principles and methods" is from 1612. The verb is from 1573.

schedule - 1397, sedule, cedule, from O.Fr. cedule, from L.L. schedula "strip of paper," dim. of L. schida "one of the strips forming a papyrus sheet," from Gk. skhida. The notion is of slips of paper attached to a document as an appendix (a sense maintained in U.S. tax forms). The specific meaning "printed timetable" is first recorded 1863 in railway use (the verb in this sense is from 1862). Modern spelling is 15c., in imitation of L.; the modern British pronunciation ("shed-yul") is from Fr. influence, while the U.S. pronunciation ("sked-yul") is from
the practice of Webster.

Actually, in many cases it's 'American' English that is the older dialect. There are many American spellings that have not changed since the 18th century. It's the British versions that have changed.