Hiring a podcast writer who is actually based in Birmingham changes the work in ways an offshore hire cannot copy. A crowded, competitive search market with sophisticated buyers. Understatement works. Advertising standards, GDPR and clear pricing all shape what you can say, and regional differences between London and the rest of the country are real.
Practically, that means your podcast writer writes in the spelling, currency and legal conventions used across United Kingdom, references Birmingham and wider England accurately, works inside your hours so a question does not cost a day, and quotes in GBP. Languages on the bench for this market: English.