With the introduction of the new BS regs this year, the new helmet models from the likes of Grays, GM and Masuri are all somewhat heavier than previous models and that is simply because they are safer - so its essential.
If you are looking to spend around £50 then the Grays Test Opener as mentioned by Felix above is a good option and possibly preferred to the Masuri Club, whereas if the budget is higher then the Masuri Test and Elite models are amongst the best available.
If you look at our YouTube channel we have a detailed review on the full Masuri range.