Homes in IP30 sell for a median of £355,000 across 297 sales over two years (HM Land Registry), which is +15% against the Mid Suffolk median of £310,000. Set against the local average rent of £1,001 a month (ONS), that implies a 3.4% gross yield here versus 3.9% for Mid Suffolk as a whole.
Rents are published per district, not per postcode, so the yield above applies the Mid Suffolk average rent to IP30 prices. It's the right way to compare postcodes on entry price, but rents do vary street by street, and gross yield ignores costs, voids and mortgage interest.
IP30 averages tell you where to look, not whether one particular flat stacks up. Paste a listing and gemhome runs the actual numbers: yield, cash flow, the lender stress test, EPC work and what the public records say about that specific address.
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