I'm ready to stand corrected, however in the main 0870 numbers are very much in decline.
There's still numerous stragglers, but less and less are in use. From experience, I suspect those left are just legacy, they live on, more that it's such a hassle migrating.
0870 numbers are inclusive to many call plans, and revenue-share was killed-off. The reasons 0870 came into being don't truly exist anymore. Many didn't get revenue, (we didn't). Today, there's alternatives. Back in the day, broadly an NGN business number with an IVR back-end, was 0800/ 0870 or you went without.
Businesses were granted 03XX to walk round the issue, what happens to the number group now? Ofcom seem to be pretty silent on this, like 070 personal numbers, will 0870 be left as an oddity to shrivel on the vine? The Telcos won't be seeing the revenue they once did, which means they'll be happier to see change.
Are there proposals to see a blanket 087 /084 etc tariff? Or will they simply cease to exist as Ofcom's move on 0500.
Best I can find is here:
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https://www.ofcom.org.uk/__data/assets/pdf_file/0028/217747/second-consultation-...