I assume you have sorted out your filter by now but a small cautionary note. Pre-war Riley 12/4 engines have the pressure relief valve AFTER the filter. Therefore very high pressures can be generated through the filter cannister and blow the internal filter tube to pieces, thereby rendering the filter useless. I assume you have the Blue Diamond conversion?
What you need is a filter that has a high flow rate (the 12/4 gear pump puts out over 6 galls per minute) together with an anti drain & pressure relief valve.
Fram make this filter under part number PH9566, equivalents are Halfords HOF233, Cooper Z831, Crossland/Unipart GFE248 & Mann W712/73.
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