Well, since i started this thread i thought i'd update it with what i finally plumped for.
I spoke with Jez at Horsham Motors and we decided on the following:
EBC Bluestuffs Pads all round
DBA 4000 front discs
EBC Ultimax rear disc
HEL brake lines
Motul 600 brake fluid
4 wheel laser alignment
All that including VAT and fitting cost £1205.
I've been driving on this setup for a few months now and have also done 3 track days.
For a track pad the Bluestuffs bite from cold is perfectly fine. No problems with day to day driving.
The very next day i was at the track. The pads take a while to bed in. Initially the pedal was quite soft and performace of the braking system not so great but after 20 or so laps of mixed braking to coat the new discs they started working a treat. It took some very aggressive braking to bed them in properly; stamping on them from 80 miles an hour down to 20 about 10 times.
With the stock Brembo setup i could only do about 7 to 10 minutes on the track before the pedal went to the floor and I'd have no brakes. Then have to wait 90 minutes for the brakes to cool. This was not due to the fluid boiling as i was running Motul 660. Measuring the front discs when coming in would show 240C.
Now I can do 15 to 20 minute stints with only a 30 min cooldown needed between them. I stop after 20 minutes not due to brake fade but due to my lack of talent, i've not tried staying out longer. On coming in, the front discs are 500C but without any fade.
If you do uprate your braking system don't forget to ring your insurance company and let them know otherwise you might not be covered. Admiral changed me £17 more with 6 months cover left.
v