There should be some sort of discount for not taking it really.
Like £4.99, which is what you pay for having it! I expect it will be optional eventually but so many people probably only have ADSL routers at present that I expect they make it compulsory to avoid confusion.
Answering a couple of points from other posters as well, otherwise it gets messy.
I migrated in onto Value Fibre from an IDNet fibre 40/10 product. The 18-month minimum term definitely applies to Value and Extra Fibre on such a migration.
As I already had a "fibre" router it was not compulsory for me to take the Plusnet freebie, but for the sake of £4.99 I decided it was worthwhile. I am surprised that anyone is being told it is now compulsory, (presumably on the 80/20 product). Similarly, I have just upgraded to Extra Fibre from the 80/20 trial, and did not have to take the new router. I am taking it to see what the wireless is like.
If of course there is some misunderstanding, and the poster being told this does not have a router with WAN input capability, then it would be fair enough. Just badly worded, and meaning such a router is necessary. (Unless a single ethernet feed from the modem is sufficient. I expect a high proportion of users these days would be flummoxed by setting up a Windows internet connection).
My broadband basic info/help site - www.robertos.me.uk
Domains,website and mail hosting - Tsohost.
Connection - Plusnet Extra Fibre (FTTC). Sync ~ 56.0/13.9Mbps @ 600m.
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.