The TomTom Go 6100 is their premium satnav, which is currently priced at £299.99 on their website.
If you purchase using the discount code, 'summer_pnd', it drops the price down to £239.99. (Not sure how long this code is valid for).
TomTom currently have a cashback offer of £50 cashback on this, which would make the price £189.99, the lowest I've ever seen it, from http://www.tomtom-promotions.com/PriorityCashback
(To obtain the cashback, the purchase must be completed by 24 August).
The terms and conditions for Quidco state that you can't combine offers with Quidco cashback, so I wouldn't risk trying, as you may lose the other cashback.
Considering this has 'lifetime' world maps available to download to the device, lifetime traffic using inbuilt sim card, (so no data costs) and lifetime speed camera updates, with a nice 6 inch screen, this is a great price.
I have the TomTom Go 6000 currently and it has saved me many hours on my weekly journey from the North of England to London. I have just purchased this, which is cheaper than I paid for the older TomTom Go 6000.
The only minor downside that I can see is that you will have to purchase an inexpensive micro SD memory card, if you really need to install all of the available world maps. The value of these world maps exceeds the cost of the device initially and they will always be upto date, without the expensive cost of paying for map renewals.
Please don't just vote cold because you don't like TomTom. or that you can use your own phone to do basic navigation.