You can get the proper liquid to test for leaks, such as Calor's biodegradable gas leak detector. The Gas Spanner

Unfortunately, you'll typically find that new gas hoses are very stiff and are difficult to push onto the fitting. You can’t mix and match propane and butane bottles and regulators - as you’ve found out, 2 different systems and one won’t fit the other There are different types of regulators for each type of gas cylinder. What gas regulators are needed for camping? There are a number of questions that always come up when searching for a gas regulator; which regulator for Calor gas, which gas regulator for BBQ, which regulator for propane tank etc. Here at Gas Equipment Direct, our aim is to make it as easy as possible for our customers to find the exact regulator they require. Both Butane and Propanegas bottles and different brands (such as Campingaz) all have different fittings for their gas cylinders. You must get the correct fitting.This takes a different regulator to the Calor Gas 4.5kg Butane cylinder (a 27mm clip-on regulator). There’s always empty gas bottles either being given away or sold cheap (fiver) on local selling groups online / Facebook Sometimes the hose on regulator kits may be a bit on the short side (we found this with the Campingaz Regulator Kit), so you may want to buy a longer hose.

Now I've seen there are clip on regulators in 20mm and 21mm fitting for butane, it would be difficult to determine by measurement if one of these were the correct regulator, if indeed either. It ought to be easy enough to measure the bottles spigot diameter; clearly the difference between 20/21mm to 27 is obvious but with care you should be able to identify the 20 from the 21. If the washing-up liquid bubbles when the regulator is open, your clips aren’t secure enough, and you have a gas leak. Then you need a Butane regulator not a Propane and this is the common gas for "clip-on" coupled regulators in the UK.

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Once you have chosen a gas cylinder for camping, you must select the appropriate regulator. This guide helps you find the correct regulator and hose. From freecycle I have been given a 13kg butane gas bottle ( not Calor ), and from the weight ( swing feel ) of it it would seem to be nearly full.