Guys

Ive just topped up the water bottle and the water appears to be pouring out of the headlight washer jets....any ideas to cause

Perhaps there are check valves and these have been frozen and damaged and gone normally open without any pump pressure? MY2011 HSE Santorini/Ivory/Piano Black/Privacy Glass/TV .Sadly gone.
Audi A5 Sportback Black Edition 3.0 tdi quattro S Line

Is it coming out of both sides?

coming out of both sides equally fast

Maybe its the headlamp washer relay which is located in the Battery Junction Box. Malaysia Boleh!
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So an electronic valve rather than a check valve,wouldn't the pump have to be on too? MY2011 HSE Santorini/Ivory/Piano Black/Privacy Glass/TV .Sadly gone.
Audi A5 Sportback Black Edition 3.0 tdi quattro S Line

the pump is definetely off...the water just pours out of the jets on both sides, first time its happened, thought it might be a pump problem or a valve problem, but one way valves normally stop the water coming back not going out....

I've no idea whether its mechanical valves or electronic but cars I've had before have check valves which only allow flow out once the pressure is over say 5psi,if these went they went OC so let water through at low pressure,just a guess really that there may be frost damage.
There is some kind of valving because on mine the headlamp wash stops when the water bottle is running low to preserve water for the windscreen. MY2011 HSE Santorini/Ivory/Piano Black/Privacy Glass/TV .Sadly gone.
Audi A5 Sportback Black Edition 3.0 tdi quattro S Line

It must be the pump (as said, possibly has frozen at some point, and is now damaged internally), there are no separate valves,just an open pipe to the nozzles. The level sensor stops the h/l wash pump operating when the level gets low to preserve some for screenwashing.Pumps are not that expensive and can be got at behind the N/S front wheelarch liner(fwd of the wheel).  RRS TDV8 Buck Blue (no, not now in my dreams). ..........D3 TDclankety clankV6 ............BMW 318i

So there are 2 separate pumps,1 for HL and a separate 1 for the WS? MY2011 HSE Santorini/Ivory/Piano Black/Privacy Glass/TV .Sadly gone.
Audi A5 Sportback Black Edition 3.0 tdi quattro S Line

Yes,there are 2 separate pumps ,from memory the h/l wash pump is the bigger of the 2.  RRS TDV8 Buck Blue (no, not now in my dreams). ..........D3 TDclankety clankV6 ............BMW 318i

Sounds to me like the HL pump has been frozen and water is just running through under gravity then  MY2011 HSE Santorini/Ivory/Piano Black/Privacy Glass/TV .Sadly gone.
Audi A5 Sportback Black Edition 3.0 tdi quattro S Line

thanks for the help guys....will check again when i top bottle up to see if its still happening, otherwise it looks like a pump change