Virgin Media increased the pricing for new customers buying their cable broadband service on its own back in May 2014. At that time existing customers were not affected, but the letters are on the door mat or in the post for those who signed up before 29th May 2014, letting them know of the £1.50 per month increase (3.75% rise on the entry level service) from October 2014.
For those who are on a 50, 100 or 152 Mbps product this should mean your new price will be £26.50, £31.50 or £39 respectively. There will be others on other price points because they are on older or slower products, or have negotiated special discounts.
Customers affected have until the end of September 2014 to voice their protest and exit their contract for free, but finding a similar priced deal with the same speeds may not be easy. While the FTTC based services can often beat Virgin Media for upload and latency performance for those chasing the fastest raw download speeds the cable provider is often the fastest option.
For those who are out of contract and don't really want to change provider, consider entering into a new 12 contract as for some customers on old products this can actually reduce your monthly price. Virgin Media gain because they then have you locked into a years contract, rather than freedom to leave with 30 days notice.