Tap Spanner

You mean the two brass nuts I presume, use a box spanner, known as a Monoblock spanner, not sure of the size, 8mm, 10mm?

http://www.screwfix.com/p/rothenber...et/40102#product_additional_details_container

Fit the flexi hose connection before fitting tap in place, easier I find.

 

Bit of a heavyweight! Have a close look at the specifications and it gives the weight as 245kg.

 

I've got this set, contains all the sizes your ever gonna need and can be used on all jobs where your nuts may be hard to reach

http://www.screwfix.com/p/box-spanner-set-8pcs/4883f

Ok, not same quality as the Rothenberger, probably, but does the job

Also B41NY, you can join the spanners together to make a really long tool if the access is really difficult
One of those simple, cheap tools that can be invaluable at times - good luck