Cracked sump miracle repairs

[TVR Sagaris]

I have somehow cracked the alloy sump on my Audi A4 1.8T going over a speedbump. I'm miles away from home and will be based here for the next four weeks so can't drop it off at my local garage to fix.

Has anyone used one of the various brands of liquid metal to repair a sump? It's a small crack near the plug but is pissing oil out currently.

Halfords may be the only option for buying stuff nearby too, so further limited by that.

Any suggestions gratefully received.

[TVR Sagaris]

Thanks all. Removing the sump means either lifting the engine or dropping the subframe on these unfortunately (it's a B5), so it's too big a job for me to attempt in a public car park with only the tools I can buy in Halfords.

I'm fearful of a big bill, but guess I will either have to have it recovered home or to a garage here to be fixed. What a horrible speedbump.