Muntons Beer Enhancer - any good?

I specialise in UK style real ale.

This stuff would work out at about 10p / pint extra I think

What is it? Is it worth the money? Is there a cheaper way to get the same effect?

I hadn't heard of this before so, here's a quote from a site as to what it is:

Enhancer contains 1kg of a blend of spray dried dextrose and spray dried malt extract which is simply added in place of sugar to any beer kit. It enhances the natural flavour of the kit

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It looks to me like it's just corn sugar and DME. Depending on what kind of "sugar" it's replacing, it may change the flavor from what the recipe intended. If there was a reason to use it, you could just make this yourself for a lot cheaper.

For any sugar in my UK ales, I like Lyle's Golden Syrup.

Sounds like it might be marketed toward the aussie style "homebrewer" (to be differentiated from the "craft brewer") maybe as an alternative the the kilo in a kit & kilo batch.

On the other hand, maybe its trying to be a better priming sugar?

I've used it before - as MM says, it's a mixture of dried malt extract and sugar, and falls between the two both in terms of price and quality. Whether it's a good idea for you to use it depends on what you're after. If you just want to add 1% of alcohol to your beer and you don't much care about the recipe beyond that, then it's fine. It would be a little more expensive than using granulated sugar, but it would be less likely to contribute a slight cidery taste to the beer. If you wanted to make the best beer you could, I'd forget it and use dried malt extract instead. This would give a less thin beer, and would leave more pleasant residual sugars in the final product.

If you post your recipe we'll be able to give you more specific comments.