Look, what's really raised my eyebrows isn't that you got your figures wrong (we all make mistakes), but that you've plunged cheerfully on drawing conclusions from them, despite the obvious red flags.
For anyone with any feel for the UK economy, the statement "We spend more public money on broadcasting than on the police," should trigger a reality check.
Sometimes eye-catching figures and conclusions do turn out to be correct, and are a revelation. Other times checking shows we've gone astray, either with the number or its meaning.
This is the art of learning from data, (rather than using it as a blind man uses lampposts - for support not illumination). Recognising "that's odd" not only helps us catch where we've wandered astray, it can open new fields of enquiry! There's a classic story about the discovery of the hole in the ozone layer: the software was programmed to ignore anomalous readings as meaningless errors. When the scientists went back to examine the raw data, it turned out the anomalous readings were of... an anomaly, and there was a damn great hole over Antarctica.
Anyway, if anyone is actually interested in police funding, here's a BBC article with a graph of both central government funding and council tax precept over several years. It's England & Wales only, up to 2014/15, real terms in 2014–15 prices, figures taken from an IFS report which on a quick glance seems very informative, explains the sources of police funding, and gives more figures and detail on what is and isn't included in them.
squishy, you may find that report interesting given your concern about local council budgets. I'm getting a bit tired, so I hope I've read it right, but in summary, central government still provided more than two-thirds of public funding to police in E&W in 2014/15, although the percentage of the police's public funding that comes from central government has dropped significantly between 1995-2015.