1" BSP Gate valve for oil tank

Hi, OK, I'll admit it - I am really, really useless at searching the internet. But I have tried, for days, honest.

All I want is an 1" BSP gate valve that will fit on my oil tank. Like ebay item 200067261386, but without the filter -just a valve.

I know they exist. I have one (that needs replacing). I can find pictures of them in web sites selling the pipe to connect to them.

But I can't find anywhere online to get one. And my local plumbing supplies shop says they don't exist any more and I have to get one with a filter on..

The reason why I can't use the one above as there isn't enough room between the tank and the firewall to get one in. I can't use one of the combined valve/filter/gauge because the tank is flat on the concrete plinth and so doesn't have the clearance for the filter bowl.

I already have everything else, the filter, the fire valve, a solenoid valve linked to the fire alarm, all fitted and working.. all I need to change is just the valve.. 1" BSP male to go in the tank and a compression fitting, ideally to 10mm, on the other..

If you know anywhere to get one, or have a mad moment and better searching skills than I, your help would be much appreciated.. Otherwise, it looks like knocking the firewall down and re-building it