I need the following;

1 x 0.625 - Front brakes
2 x 0.700 - Rear brakes and clutch

Is the only choice Wilwood?

obp do them

http://www2.obp.uk.net/catalog/product_info.php?cPath=32_63&products_id=84&osCsid=4a6e8df523ae393146457adcd4068647

wilwood, girling, and AP (i think) are the three manufacturers.

i'd go with wilwood though

Most aftermarket brands are Girling clones

You will find Landrover parts specialist sell clone Girling 19mm master cylinder originally used the Land-Rover series2A clutch for a very reasonable sum compared to other suppliers.

for example see http://www.famousfour.co.uk/new_parts/parts-veh-series-sec-clgb.html