Thanks to robinessex for the idea and Big Al for the mod-nod.

Let's try keep the motorways and junctions in a sensible order.

Motorway	Junction	Station	Directions
A1(M)	J46 Wetherby (N)	Morrisons	Head towards Wetherby for 3/4 mile. Cafe & toilets in mainstore
A1(M)	J48 Boroughbridge	Morrisons	Head towards Boroughbridge for 1/2 mile. Cafe & toilets in mainstore
M1	J11 Luton	Tesco	Take the A505 toward Dunstable, go straight on at first roundabout, Tesco immediately afterwards on the left
M1	J16 Northampton	Shell	Take the A4500 towards Northampton. Petrol station is just off the first roundabout, on the opposite carriageway
M1	J21 Leicester	Asda	Take the A5460 toward Leicester, go straight on to Fosse Park shopping park, Asda fuel station on the right (shop itself on the left)
M1	J21 Leicester	Sainsburys	Take the A5460 toward Leicester, immedietely take the left filter around the "corkscrew" to the A563 South, Sainsburys on the left
M1	J30 Sheffield South (Barlborough)	Jet	Take the A6135 towards Sheffield. Petrol station is half mile from motorway just after the end of the dual carriageway section
M1	J34 Meadowhall	Sainsburys	Next to Meadowhall Transport interchange, back on at the other end of the Tinsley flyover.
M1	J46	Sainsburys	Head towards Leeds, turn left at the next roundabout, Sainsburys on the right, Mcdonalds / KFC on left
M3	J4	Sainsburys	Approx 1/4 mile North on A331 towards Camberley
M3	J9	Tesco	Follow signs to Trading Estate from junction roundabout
M4	J11	Shell	1 mile from junction 11, not the main reading roundabout exit but the smaller on signposted for the uni/early IIRC
M4	J12	Sainsburys	0.1miles From the exit, head towards reading and you can't miss it
M4	J15	Sainsburys	3.5 miles north on A419 for A420 and Sainsburys exit
M4	J15	Esso	0.5 miles south towards Marlborough
M4	J16	BP	A few hundred yards up Great Western Way towards Swindon
M4	J16	ASDA	Don't use the BP, expensive, dirty forecourt, uncaring staff. Turn left at first roundabout, at third roundabout is Asda. 3/4 mile
M4	J17	BP	3/4 mile North on A429
M4	J17	Esso	2 miles South on A429, currently closed, Burger King open
M4	J17	Morrisons	2 miles South on A429 - Right at first roundabout, left at second - Morrisons supermarket with fuel
M5	J2	ASDA	Petrol station is accessible from the J2 roundabout.
M5	J3	Shell	Follow A456 towards Halesowen for half a mile. Shell station on left.
M5	J4	Morrisons	Head towards Birmingham on the A38 for a couple of miles, on the left
M5	J9	Garage	Head towards Tewkesbury on the A438 for half mile, on the left
M5	J9	Morrisons	Head towards Tewkesbury on the A438 for a mile, on the right
M5	J13	Shell	Head towards Stonehouse on the A419 - there is a Shell station at the next roundabout half a mile away
M5	J17	Several stations	Cribbs Causeway complex
M5	J20	Shell	Head towards Clevedon (only exit), then right at the immediate roundabout and left at the next - there is a Shell station on the right
M5	J27	Shell	Sampford Peverell east side of junction on roundabout. Burger King and Travelodge
M6	J3	Tesco	Head towards Coventry on A444 for half a mile, straight over roundabout and on left in 200yds
M6	J18	Texaco	Station and Co-Op food store less than a mile to the east - towards Holmes Chapel
M6	J18	Shell	Station approx 2 miles to the west - towards Middlewich
M6	J19	BP	Station just off the roundabout - northbound towards Mere/M56/Manchester Airport
M6	J23	Shell	Just off the motorway, west side of junction
M6	J25	Several Stations	turn left at the roundabout at the end of the slip road
M6	J36	Texaco	Less than a mile off the motorway, head towards Crooklands
M6	J43 Carlisle	Tesco	Less than half a mile off the motorway
M6	J44 Carlisle	Asda	Just off motorway on A689
M11	J8 Stansted	Esso	On B1256 towards Takeley, just off the roundabout, typically 10p/L cheaper than services on other side
M11	J7 Harlow	Shell & BP	On A414 towards Harlow, approx 1 mile off the M11
M18	J1	Morrisons	Head towards Rotherham, turn left at the next roundabout
M18	J4 Doncaster	Sainsburys	Take A630 West, go straight on at roundabouts until the A18 roundabout, Sainsburys on left
M20	J5 Maidstone	Sainsburys	Turn off towards A20/Aylesford. Turn right at the roundabout. After 400 yards Sainsburys is on the left
M25	J8	Several Stations	Follow A217 towards London / Sutton. Just past the first roundabout on the left is a BP, or the right is a Shell
M25	J13		Head for Egham, take first left at roundabout, Petrol station opposite Burger King (for toilet break)
M25	J21A	Shell	follow the North Orbital toward St Albans
M25	J22	TescoSainsburys	visible from the roundabout (indeed from the southbound M25 before you get to J22)
M25	J28	-	Come off to roundabout below, take the A1023, garage on the left as you leave the roundabout
M40	J4	Asda	Take A4010 towards Aylesbury. Then left at the mini roundabout and follow the road round to the right.
M40	J10	Esso	Take A43 approx half mile towards Brackley, Garage on roundabout with A4100
M40	J12	Esso	Take B4100 towards Gaydon, then left at roundabout
M42	J4 Shirley	Tesco 24 HR petrol	less than half a mile from M42 J4
M60	J17 Prestwich	Tesco 24 HR petrol	0.1 miles on A56 Towards Manchester centre
M62	J28 Leeds	Sainsburys	Approx 1 mile A653 towards Leeds
M69	J1 Nuneaton/Hinckley	Texaco	Take A5 West towards Nuneaton, on right hand side after about 1/4 mile
M69	J- (North End)	Asda/Sainsburys	Refer to M1 J21 above