How can we repressurize this Alpha CD28C boiler please?

[fisionchips]

My daughter lives in the Brighton area and has recently moved into a rental property. The boiler is showing alternating flashing A and B indicators which tells us that the boiler needs repressurizing. However, looking at the underside, there seem to be taps missing from the valves either side of the repressurization loop hose and she is having a lot of difficulty (access is difficult and at height) turning these valves - has anyone any suggestions on what she could fit on these valves to aid opening and closing? I have attached a photo with the valves (what we think are the correct valves ) circled in red. Advice would be very much appreciated.

 

[DGT plumbing]

A 7mm spanner or a set of mole grips And yes they ere the correct valves.

 

[fisionchips]

A 7mm spanner or a set of mole grips And yes they ere the correct valves.

Brilliant... thanks!

 

[steadyon]

Don't touch the hexagonal head on the lower part of your picture, nearest the flexible braided hose as it's not a valve. Only turn the one nearest the brass pipes, and the one in the upper part of picture.