This hook will change the customer inputted UK postcode to the format that is well known within the UK. Examples;

Aa25Ra becomes AA2 5RA
wc1a1aa becomes WC1A 1AA
QA1 1QA will return a "Invalid Postcode" message as this postcode does not exist

I have tested this using some of the more "weird" postcodes, and it does seem to function properly in all cases.

If the price of this addon does not suit your business, contact me anyway. I'm sure we can come up with a good deal that suits each other. Prices are not set in stone.