Hi,
Assuming you have the standard candlepower lights, you only have to block off the glass that focuses the dip beam. Looking directly into the headlight it's the defined wedge shaped part that covers approx 8o/c to 7o/c.
I've seen GB cars with black insulation tape cut to shape on the glass and been passed by French police. Alternatively spend about £20 at the ports for fancy sticky AA approved plastic and a trimming knife that does much the same thing.
I can't vouch for the halogen lights on a 7 as I'm still to fit them.
Adam
TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, 214 Cam, Lumention, Tubular Manifolds, Single Pipe Exh, 3.08 Rear, 200lb Spax & PolyBushes, Anti- Dive, Capri Vented Discs & Calipers, Braided Hoses, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AT 5 Spokes and Cruise Lights. No Door Stickers. Mine since July 1986, V8 from 1991