Morgancomputers stocks the three following quad phone packs for GBP 29.99+delivery+vat.
Motorola Quad DECT Phone pack
Philips 1224 Quad DECT Phone pack
OneTel DECT Quad Pack & Answerphone
More specs on their website. You can collect from the store in Central London but you will not get the 2% cashback if you do so.