However in the manual it states it may need a type c mcb due to in rush current. Is this definitely needed ?

Probably depends on the rating as well as the type they specify - a B32 (min current for instantaneous current 3x In = 96A, whereas for a C16 it would be 5x16A = 80A). So if the specify a C16 you're probably fine, at least from the heater's startup.

If you had lots of other appliances on the same circuit starting up at the same time though (e.g. power coming back on after a power cut or the MCB being reset) there might be problems, but the rarity of such events may well make it tolerable.

     - Andy.

In theory you could use a dedicated circuit and a10-amp MCB, but it may trip a B10 whereas it would not trip a C10.

As Andy J says it won’t trip a B32, presumably there’s a 13-amp fuse in an SFCU, that’s more than double the running current so I would not expect there to be an issue with that.

If a 10 amp MCB was used, as is common in some places, then a type C might be prudent to avoid tripping on inrush current.

A 13 amp fuse and a 32 amp B type MCB should be fine. The fuse is rated for about twice the running current and the MCB at about five times the running current. It is presumably a halogen lamp, and these are routinely used from standard 13 amp fuses and standard types of UK power circuits.