Last time this went hot for £79 as well at Halfods. So probably means this is not a bad price for a tomtom with free lifetime map updats. ALSO tesco is doing £20 off when spending £100 on Technology and Home Electrical, so this means you can enjoy an free item worth £21!
I ordered the Tomtom along with a Sony RDPM7IPNB Speakerdock for iPhone 5/5s/6/6 Plus. The speaker sells £29 at tesco which I think is not a bad price already. Link: http://www.tesco.com/direct/sony-rdpm7ipnb-speakerdock-for-iphone-55s66-plus/255-5146.prd?pageLevel=&skuId=255-5146
So I spend £88 to get a Tomtom XL and a Sony RDPM7IPNB speaker along with TCB and clubcard points.