Nessie, personally I would only use walk run to get back into running but that is only me and as you know I have always said that we all run different ways and different things suit different people. As Kev syas, give it a try and see how it goes but your method of 5 run, 1 walk sounds good and will certainly help. Try upping the run bit to six and maybe 1:30 and so on just to increase your threshold. As I say it is a good way to lead to something, I did it when I came back from injury and it certainly has made life easier getting back into my stride!!!! ps, I am only 10!!! 
Toby, how did it go at Llanelli? If it was anything like Bristol it must have been freezing!!!!!
Chris, well done mate, I wont say anything about Bath but I hope you are not suffering afterwards!!!!
Ffran, I kow exactly how you feel weatherwise, I really suffered today on my long run as it seems every run is done in freezing conditions with no respite.. Maybe I am just getting too soft in my old age!!!!
I forgot to apologise for not paying you lovely people much attention, I am really struggling getting into my training this time. I am hoping it is just down to the weather and the fact I am squeezing so many long runs in without a break. Did my easy recovery last monday and that was ok, then did a quick 9 miles on Thursday which includes a tough hill in it but it felt ok. Then this morning started my 16 mile run in -3, really struggled to get warmed up and throught the run. To my surprise though on the last mile which includes about 1/2 mile uphill section we where doing 9 min miles and then on the last downhill section we managed a quick run. Overall the run took 2:37 mins so although it was tough it was quicker than I had planned it to be. Anyway we have decided to just do a couple of easy 10K recovery runs this week and than a 10mile easy on Sunday before we get into the second half of the training. Only 7 weeks to go so I suppose it will only get tougher from now until the taper so I suppose the fact I have no adverse reactions on the Mondays and still able to run during the week is a big plus!!!!!