looking for a service area checker

looking for a plugin that would allow customer to enter the postcode (UK)

and UK post codes can be from 5/7 letters/numbers also would need it to allow wildcard example TB1 * and all so not be case sensitive so tb1* and TB1* would work

how our server works its a 20mil radius from the office so thats why wildcards would be amazing also if it did not allow wildcards post codes would reach 7k+ post codes and that does not seem optimal at all if it did allow wild cards would be reduced to 70

hope this can be update or maybe you can do custom work for us to allow this

thanks