Leaking washing machine compression valve

[Homealone]

Hi. I have a leaking compression valve (I think) for the cold water feed to the washing machine.
When I moved in to the house a few years ago, it dripped whenever the cold water was turned on- a plumber was checking the (failing) boiler and had a look (I think it was something to do with a washer) and I thought it was fixed (there’s maybe been a small drip, but more like condensation), but I’ve always kept it off and turned it on via the blue tap as and when I’ve needed the washing machine just in case.
Today, turned the tap to do some washing, and it is dripping far quicker than I’ve seen it before, from the side of the cold water entry into the house (left).

Is this easy to fix? (Note I am not diy capable at all) Or do I need a plumber?

 

[conny]

You just need someone to nip the left hand side joint up with a couple of spanners or pipe pliers. Don't overtighten. A friend/neighbour should be able to do it, rather than pay for a plumber.

 

[45yearsagasman]

It may also be leaking from underneath the blue handle. These valves don't like being turned on/off regularly.

 

[Madrab]

Small philips screwdriver and take off the blue handle and see if it's leaking from the top first, if not then a nip of the nut may do it.