when you say UK ISP do you mean UK Based or 100% UK? as some host in the USA .
i would not use 1&1, what specification are you wanting for £25.
Donhost are quite good but are quite exspensive.
fasthosts is another that some like... but as a rule they say unlimited Bandwidth but its about 5 GIG.
i'm not to hot on whats around for UK Hosts wise.... as i use US servers
E:magineHosts (Department Of E:magine Limited) emagine the possibilities
Aaron - CTO, founder & Director Of Technical Support/Customer Support/Technology of E:magine Limited Windows,Linux, VPS Hosting environments
If ISP in terms of connecting to the internet, I highly recommend Pipex. 2 Years of service, and only 2 moments of downtime(3 if you count the time I got a new card and forgot to tell them about it (My fault)).
Is it lower pricing only where they serve (since they have their own equipment and can be independent of BT Wholesale pricing policies).
If you are served by UK Online (part of Easynet) you can have a 500 kbps connection for 9.99 a month, but if there is no Easynet kit near you, they use BT, and price jumps up to 19.99 a month (still not most expensive)
Only a few hundred UK exchanges have Bulldog or Easynet equipment (about 4.5m people are in areas served by UK Online, so a long way to go).