It depends when you ask them to downgrade you from, it can be from near instant to 30+ days time depending on what you asked for/what you have, either way hub reboots won't make any difference or all people would do is just avoid rebooting them post downgrade.
I reboot the hub last night, hub download new profile setting then reboot again, now running stable at 100mb. Not really missing the extra download speed apart from downloading games, but do wish to have more upload speed.
Its that time of year...Virgin renewal due 12th of March, so under a month.. Will be calling them later
Currently on TV (M), Vivid 100 and Talk more anytime phone. Currently on £43pcm, going up to £58.
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When I called last week, they can see I rarely use TV but use a lot of broadband so they offer me: Mix TV/basic phone plus broadband (350mb for £60pm, 200mb for £50pm and 100mb for £40pm). At the end I took the cheapest package.
I wish I can use thinking of leaving virgin to see if they offer better deal but in my area only virgin offer fast broadband, other ISPs only can provide around 15mb.