UK2Numbers are one of the worst companies I have ever had to deal with in my 30 years of business. After paying them charges each year they refused to allow me to change the business name on my account unless I paid them £60. When I refused they suspended my account and 0845 numbers with a few days notice directly causing me to loose business. When I then under duress agreed to pay the charge they still refused to reinstate my numbers as I had dared to challenge them. They ignored all subsequent correspondence. This was the main no for my business and is on all my stationary. The 0845 numbers can only be transferred to BT and only if the number is in service which UK2numbers had deliberately put out of service. Neither Nexus Telecom who supplies the number to UK2numbers or OFTEL could assist.
I therefore took legal action against them as a result of their wholly unreasonable actions which I won but couldn't enforce as they only give out an invalid service address as their registered address. They do not reveal their true physical address (the court has now ordered them to disclose this to me). They have also managed, at great expense, to overturn the court judgement on a technicality and the matter will be retried. If you use them for your business then BEWARE of this company and migrate your numbers to another provider ASAP before you regret it like I did.
PS For a company that is in the business of providing phone numbers it is very strange that is doesn't provide one for itself.