Below are links to where you can quickly check the prices, and buy, the best cordless phones on the market. Links are generally to Amazon UK, which seems to be making the effort to offer very competitive pricing, and of course the delivery and trustworthiness of the company is something in which you can be pretty confident.
Panasonic KX-TG8090 with answering machine
Highly rated for its answering machine performance, take it anywhere around the house, the battery runs for ages if you leave it out of the base unit, and it can even send text messages. And the price is a snip. Click here for a quick link to check the price of the KXTG-8090 at Amazon UK
Panasonic KX-TG8092 with answering machine and second handset
Similar to the above, but with a second handset. Click here for a quick link to Amazon UK
Panasonic TG7200E - single handset
No answering machine, but if you want the most straightforward, best value cordless phone on the market, this is the one to go for. Tremendous Panasonic quality and performance at a bargain price.
Full specs and prices at Amazon UK
BEST BUY: Panasonic TG7203E Trio
Similar to the above, but with two extra handsets for distributing around the house. You won't regret it. Direct link to the Amazon UK details page
Philips CD4451S/05 with answering machine
Another model with a good battery life (useful if you're prone to not replacing the handset in the cradle). Nice speed dial feature.
Click here for a quick link to see the best price at Amazon UK
Philips CD4452S/05 with answering machine and second handset
Similar to the above, but with a second handset. Click here to check the price and order from Amazon UK
BT Domus with answering machine
As good as the three designs above, but perhaps a touch more stylish. Huge phonebook and you can transfer contacts from your mobile, which is rather cool.
Full details at Amazon UK
BT Domus Twin with answering machine
Similar to the above, but with a second handset. Click here for the details at Amazon UK.