Probably you will have to ask the customs as they will be the main problem creators. Once you get past them, it should not be any problem. Arms Act 1959 is not applicable to imitation firearms. As per Arms Act 1959 Section 45. Act not to apply in certain cases. (c) any weapon of an obsolete pattern or of antiquarian value or in disrepair which is not capable of being used as a Firearm either or without repair; (d) the acquisition, possession or carrying by a person of minor parts of arms or ammunition which are not intended to be used with complementary parts acquired or possessed by that or any other person.Now my query is will a UK certificate of deactivation work here in India??
BTW value of £225 appears too steep, unless you are a purist interested in collecting "original". If I am able to recall correctly, arshad_ahmad48 was also selling similar replicas. You can try contacting him or take a printout of the picture of revolver, its components and take it to any lathe shop. You can get similar imitation firearm manufactured locally at much cheaper rate. Only ensure no chambers are drilled in the cylinder and barrel is not bored. You can also try contacting the following and see if they are willing to make similar item as they are already into making muskets, replicas etc. http://www.curioushouse.com/about_us.htm