Cambrian Patrol has always been attended by detachments from our regular Infantry battalions and they do quite well.
The idea of sending the LCB is to pitch garden infantry units against possibly SF teams from other nations.
There is no guarantee that Pakistani teams will come out on top however as long as they are among the top teams is what matters.
For the "more advanced competitions" you mention, I recall a few years ago, SSG participated in one of the most grueling SF competition hosted in South Africa called Ex. Airborne Africa (10 events including the things you have called out). Indians were there too but it was their second outing. SSG came out from the cold into the exercise and in a competition of over 20 countries, came in 4th after the hosts South Africa, India, and the Netherlands. There were quite a few European and Middle Eastern outfits there too. So we attended and our scores were a few points shy of the South Africans as the margin was very small. Point being, when it comes to real exercises and not "expo shows", we have done well.
Secondly, as someone mentioned GROM, forget about them as they are just cutting their teeth in Afghanistan now. SSG has more experience than most SF outfits put together. This goes for special forces missions in conventional wars and also in counter terrorism. While there is always room for betterment, ours is not a shabby bunch either ;-)
While they can always get more infusion is equipment and technology but you can only buy what you can afford. Ask any professional officer about what it takes to make it to the SSG and even those who dislike the SSG for various reasons will admit that it is no easy task and this in an army which is extremely labor intensive as is (meaning our regular infantry units have it much harder than most European/Middle Eastern Armies.)
Lastly, such competitions are about preparing a certain way to perform well. The events and methodology are chosen by the host nation. They may or may not reflect reality. Sometimes your preparation pays off, other times it does not. Think of it like any other cricket match or other sport. As long as you can compete well because your own training is realistic and tough, you are good and it does not matter whether you place 1st or 2nd or 3rd. Just need to compete well and be amongst the top teams.