IIRC it is 2Mbps. Certainly not more than 5Mbps.
You have probably been confused by Infinity not being available if the estimate is below 15Mbps. Which is where BT Retail offer Faster broadband with fibre, if that's what they still call it.
I don't think any other ISP draws a line like that.
My broadband basic info/help site - www.robertos.me.uk
| Domains,site and mail hosting - Tsohost
Connection - Plusnet
UnLim Fibre (FTTC). Sync ~ 56.6/14.1Mbps @ 600m. - BQM
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